I feel exactly the same hun, I'm thinking DD would still be napping for only 45mins at this age if I hadn't found this place!! Or else I'd have gone clinically insane

Yk what, I'd go out and about if I were to do it again. I drove myself nuts making sure I was home for each nap and tbh that nap really won't matter in time. Ideally you'd really want to be at home for the first one, but that's not always possible when we start pushing it out later. They go and fall asleep int he car on the way back just to mess things up! Anyways, if you can be at home for the first one more often than not that'll be great.
The standing up thing drove me nuts. It's also classic UT behaviour but we can't do too much about it or else we'll be pushing it out far later and BT will get a little messed up. I do think in time we'll try for the CN at 4pm or even 4.15pm for 20/30 mins or so eventually.
I would leave him to it if he can get back down again? As long as he's happy. Even the quiet time in bed helps (except when they learn they can jump by holding onto the side

). I'd persevere for the length of the nap (or 30mins), then get him up and do some low-key stuff and shoot for an EBT at around 6.30pm. Except some OT NW's in the early part of the night.
Let's see how we go for the next couple of days ok? Let me know if he takes the CN or not, then we'll revisit. We can always make a new plan..that's the fun with these bubbas, the tweaking never ends

xx