Comment 23 for bug 1053910

strace gives me this:

8549 sendmsg(7, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\0\1\21\0\0\0\20\0\0\0\177\0\0\0\1\1o\0\25\0\0\0/org/fre"..., 144}, {"\f\0\0\0org.kde.kded\0", 17}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 161 <0.000015>
8549 poll([{fd=7, events=POLLIN}], 1, 25000) = 1 ([{fd=7, revents=POLLIN}]) <0.000061>
8549 recvmsg(7, {msg_name(0)=NULL, msg_iov(1)=[{"l\2\1\1\t\0\0\0\6\0\0\0=\0\0\0\6\1s\0\6\0\0\0:1.169\0\0"..., 2048}], msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 89 <0.000009>
8549 recvmsg(7, 0x7fff71c561e0, MSG_CMSG_CLOEXEC) = -1 EAGAIN (Resource temporarily unavailable) <0.000010>
8549 sendmsg(7, {msg_name(0)=NULL, msg_iov(2)=[{"l\1\0\1\0\0\0\0\21\0\0\0k\0\0\0\1\1o\0\5\0\0\0/kded\0\0\0"..., 128}, {"", 0}], msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 128 <0.000010>
8549 poll([{fd=7, events=POLLIN}], 1, 25000) = 0 (Timeout) <25.020763>

Last <number> show the time spent in system calls.
poll() = 25 seconds
I've 4 of these in one run:
8549 poll([{fd=7, events=POLLIN}], 1, 25000) = 0 (Timeout) <25.020763>
8549 poll([{fd=7, events=POLLIN}], 1, 25000) = 0 (Timeout) <25.008094>
8549 poll([{fd=7, events=POLLIN}], 1, 25000) = 0 (Timeout) <25.025128>
8549 poll([{fd=7, events=POLLIN}], 1, 25000) = 0 (Timeout) <25.025123>
25 second each = 1 minute.
All are similar.