Jem88, how's it going? Btw I wouldn't worry too much about the days getting longer, I think that happens with most LOs to some extent when they're on 2 naps but almost needing just 1. We've had a few ok weeks with 13.5h days here and there, although I always used to think that DS did better with at least 11h at night.
We're having our first intentional 1 nap day! Yesterday was also 1 nap, but only because he refused the am nap. Slept 2h without a peep, then stirred a bit but went back for another 30mins before waking up - wasn't very happy when he woke though, not sure if he was OT or just a bit confused?! Today's nap isn't going so well though

He's stirred several times, firstly at the 45min mark, but went back to sleep quickly, but now he's awake at the 2nd 45min mark and it also sounded like he almost woke several times in the middle. Just babbling quietly to himself, no crying as yet, and it's not 'hey I'm awake and ready to go' babbling either! So I clearly have some way to go in guessing what time to PD for this 1 nap... if I give you the last couple of days' timings, does anyone have any thoughts? On a good 2 nap day, he does 4h 45mins A time to BT, but might take another 15mins to get to sleep.
Yesterday - night wasn't great, probably due to painful nappy rash

Seemed v tired in the morning so aimed for 2 nap day but got:
6:30 WU
9:30 PD for nap - wasn't having it so got up at 10am and gave big snack
11:15 PD for nap (bit delayed due to nappy etc) - cried a bit and went to sleep 11:20, stirred 1:20, woke 1:50.
6:15pm Straight to sleep, had the odd cry-out in his sleep but put it down to the rash, other than that slept all the way through

until...
Today so far:
6:30 WU (seemed bright and had had a good night so decided to try for 1 nap)
11:15 PD but cried a bit and finally went to sleep 11:30. Woke 12:15 but straight back; woke 1pm and babbled on and off quietly for ages, keeps going quiet so I think he's gone back but then I hear more babbling in the monitor... Sure he must still be tired... but now he sounds more lively at 1:30pm... Was he OT/UT??? Still, he's happy so I'll keep him there a bit longer... if he doesn't get back I'll try EBT at 5:30!
Any ideas? At his childminder, with a 6:30 WU (or often earlier), he'll do 20mins am nap around 9:30 and then his long nap (2h) is at 1pm, so I've no idea whether 11:30am for his 1 nap is likely to be OT/UT?? All I know is that the last time he refused his am nap, his pm nap was delayed (lunch, nappy etc) until 11:50 and this was definitely OT.
Ok he's sounding less happy now, think I'll get him up!