Comment 3 for bug 1473899

There are some possible performance improvements on master (commit 2328983, for example) that might help, depending on the particulars of your ring. However, a part-power of 24 is, frankly, enormous. A rebalance typically takes a minute or two for a part-power of 18; scaling that up to a part-power of 24 means I'd expect anywhere from 1 to 2 hours per rebalance.