The time it need for each tests (tested on node rizzo with 5.3.0-40-generic):
$ time sudo ./nsleep-lat
nsleep latency CLOCK_REALTIME             [OK]
nsleep latency CLOCK_MONOTONIC            [OK]
nsleep latency CLOCK_MONOTONIC_RAW        [UNSUPPORTED]
nsleep latency CLOCK_REALTIME_COARSE      [UNSUPPORTED]
nsleep latency CLOCK_MONOTONIC_COARSE     [UNSUPPORTED]
nsleep latency CLOCK_BOOTTIME             [OK]
nsleep latency CLOCK_REALTIME_ALARM       [OK]
nsleep latency CLOCK_BOOTTIME_ALARM       [OK]
nsleep latency CLOCK_TAI                  [OK]
# Pass 0 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0

real	2m7.350s
user	0m0.024s
sys	0m0.000s


$ time sudo ./set-timer-lat 
Setting timers for every 1 seconds
CLOCK_REALTIME         ABSTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_REALTIME         ABSTIME PERIODIC max latency:     154950 ns : [OK]
CLOCK_REALTIME         RELTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_REALTIME         RELTIME PERIODIC max latency:     155470 ns : [OK]
CLOCK_REALTIME         ABSTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_REALTIME         ABSTIME ONE-SHOT max latency:     152090 ns : [OK]
CLOCK_REALTIME         ABSTIME ONE-SHOT count:                   1 : [OK]
CLOCK_REALTIME         RELTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_REALTIME         RELTIME ONE-SHOT max latency:     140419 ns : [OK]
CLOCK_REALTIME         RELTIME ONE-SHOT count:                   1 : [OK]
CLOCK_MONOTONIC        ABSTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_MONOTONIC        ABSTIME PERIODIC max latency:     153497 ns : [OK]
CLOCK_MONOTONIC        RELTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_MONOTONIC        RELTIME PERIODIC max latency:     151476 ns : [OK]
CLOCK_MONOTONIC        ABSTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_MONOTONIC        ABSTIME ONE-SHOT max latency:     149738 ns : [OK]
CLOCK_MONOTONIC        ABSTIME ONE-SHOT count:                   1 : [OK]
CLOCK_MONOTONIC        RELTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_MONOTONIC        RELTIME ONE-SHOT max latency:     140657 ns : [OK]
CLOCK_MONOTONIC        RELTIME ONE-SHOT count:                   1 : [OK]
CLOCK_BOOTTIME         ABSTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_BOOTTIME         ABSTIME PERIODIC max latency:     153272 ns : [OK]
CLOCK_BOOTTIME         RELTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_BOOTTIME         RELTIME PERIODIC max latency:     148789 ns : [OK]
CLOCK_BOOTTIME         ABSTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_BOOTTIME         ABSTIME ONE-SHOT max latency:     146898 ns : [OK]
CLOCK_BOOTTIME         ABSTIME ONE-SHOT count:                   1 : [OK]
CLOCK_BOOTTIME         RELTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_BOOTTIME         RELTIME ONE-SHOT max latency:     139261 ns : [OK]
CLOCK_BOOTTIME         RELTIME ONE-SHOT count:                   1 : [OK]
CLOCK_REALTIME_ALARM   ABSTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_REALTIME_ALARM   ABSTIME PERIODIC max latency:     157077 ns : [OK]
CLOCK_REALTIME_ALARM   RELTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_REALTIME_ALARM   RELTIME PERIODIC max latency:     151637 ns : [OK]
CLOCK_REALTIME_ALARM   ABSTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_REALTIME_ALARM   ABSTIME ONE-SHOT max latency:     147835 ns : [OK]
CLOCK_REALTIME_ALARM   ABSTIME ONE-SHOT count:                   1 : [OK]
CLOCK_REALTIME_ALARM   RELTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_REALTIME_ALARM   RELTIME ONE-SHOT max latency:     138752 ns : [OK]
CLOCK_REALTIME_ALARM   RELTIME ONE-SHOT count:                   1 : [OK]
CLOCK_BOOTTIME_ALARM   ABSTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_BOOTTIME_ALARM   ABSTIME PERIODIC max latency:     155109 ns : [OK]
CLOCK_BOOTTIME_ALARM   RELTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_BOOTTIME_ALARM   RELTIME PERIODIC max latency:     150989 ns : [OK]
CLOCK_BOOTTIME_ALARM   ABSTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_BOOTTIME_ALARM   ABSTIME ONE-SHOT max latency:     147849 ns : [OK]
CLOCK_BOOTTIME_ALARM   ABSTIME ONE-SHOT count:                   1 : [OK]
CLOCK_BOOTTIME_ALARM   RELTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_BOOTTIME_ALARM   RELTIME ONE-SHOT max latency:     141602 ns : [OK]
CLOCK_BOOTTIME_ALARM   RELTIME ONE-SHOT count:                   1 : [OK]
CLOCK_TAI              ABSTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_TAI              ABSTIME PERIODIC max latency:     152173 ns : [OK]
CLOCK_TAI              RELTIME PERIODIC timer fired early:       0 : [OK]
CLOCK_TAI              RELTIME PERIODIC max latency:     147688 ns : [OK]
CLOCK_TAI              ABSTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_TAI              ABSTIME ONE-SHOT max latency:     145860 ns : [OK]
CLOCK_TAI              ABSTIME ONE-SHOT count:                   1 : [OK]
CLOCK_TAI              RELTIME ONE-SHOT timer fired early:       0 : [OK]
CLOCK_TAI              RELTIME ONE-SHOT max latency:     139589 ns : [OK]
CLOCK_TAI              RELTIME ONE-SHOT count:                   1 : [OK]
# Pass 0 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0

real	2m0.066s
user	0m0.013s
sys	0m0.004s


$ time sudo ./inconsistency-check 
Consistent CLOCK_REALTIME                 [OK]
Consistent CLOCK_MONOTONIC                [OK]
Consistent CLOCK_PROCESS_CPUTIME_ID       [OK]
Consistent CLOCK_THREAD_CPUTIME_ID        [OK]
Consistent CLOCK_MONOTONIC_RAW            [OK]
Consistent CLOCK_REALTIME_COARSE          [OK]
Consistent CLOCK_MONOTONIC_COARSE         [OK]
Consistent CLOCK_BOOTTIME                 [OK]
Consistent CLOCK_REALTIME_ALARM           [OK]
Consistent CLOCK_BOOTTIME_ALARM           [OK]
Consistent CLOCK_TAI                      [OK]
# Pass 0 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0

real	1m45.074s
user	1m21.003s
sys	0m24.068s

$ time sudo ./raw_skew
WARNING: ADJ_OFFSET in progress, this will cause inaccurate results
Estimating clock drift: 14.683(est) 14.685(act)	[OK]
# Pass 0 Fail 0 Xfail 0 Xpass 0 Skip 0 Error 0

real	2m0.013s
user	0m0.002s
sys	0m0.011s