As selfish as it sounds, sometimes as early as 6.24pm lol.
NOT selfish. Smart! And doing what works so that you don't collapse in a heap!!

My two are often in bed by just past 7pm, so then i stay quiet for about half an hour, then do a few things that might need doing like mopping etc. Usually by 8/8.30 i can sit and relax.

Ask DH though...once the kids are in bed, he's done for the day!