For our workplace accounts, it works out to weekly which is some nice smooth DCAing (we both get paid biweekly, and are even on the same schedule, but DW's TSP deposits Thursday midnight right before payday, and my 401k doesn't deposit until the following Thursday, so that works out to weekly).
For aftertax and 529s, monthly at the beginning of the month.
I just started doing backdoor Roths, and may finally get an HSA this year if DW agrees to the HDHP work offers, and going forward, I will fund those at the beginning of the year, or at least as soon as the checking account recovers from the property tax bill.