I'm a workaholic so dialling it back has been hard for me. But i know when my body has had enough so I'll stop for the day. I've gone from doing 18hr days to 10-12hrs and everyone reckons that's still too much. Listen to your body, only you know when you need a break.
I've been picking up yards of dirt in my truck and shoveling it out. 3 loads so far and yeah there has been a few times where I tell myself I need to stop.
Sounds like thats reasonable. Too much is when your body says "ive had enough for now." You only can be the judge of whats too much. I know when to stop when I start getting dizzy,out of breath,hurting, or extremely fatigued. If you feel great, keep doing your normal activities. Your the best critic for your body. Take care