Add a form of #waituntil (set number '0' maybe) that will wait on all sets. This may seem stupid at first, but it has application on plans which are continued on a night after which the prescribed #sets were not completed. It picks up where it left off. This #waituntil would work to pace startup. Later in the night it would just be ignored (with the "wait no more than 12 hours" rule this is OK for time-only #waituntils too).