13 month old: A time after a 20 min am cat nap?

[Peek-a-boo]

DS is 13 months old and starting to need so much A time we're running out of places to put it.  I'd love to move him to one nap, but I don't think we're quite there yet.

He was doing

3.5 hours A time
30 minute cat nap
3 hours A time
1.5 hour nap
5 hour A time

Which left him with a really late bed time and really short night.

I just cut his am nap down to 20 minutes, hoping that would help shorten up the A time between his naps, but I'm struggling to figure out what to cut it to.

He also just seems REALLY tired at 3.5 hours and falls asleep easily then (the one time of the day) so I don't see how we can drop all the way to just one nap yet, although I'd love to.  So . . .

What is a typical A time following a 20 minute am cat nap?

[Tweakster]

We started at 2.5 hrs but that was at 11 mths.  He could manage 3 hrs by 12 mths after his 20 min nap and then we had to push him to 1 nap so it was all moot.

I'd say 2.5/3 is pretty average to start.

[Peek-a-boo]

Thanks!  Some how I had in my head that post 20 minute nap it would be shorter and was getting discouraged that he wasn't cooperating.  

[Edesanja]

J still did 3hrs15 after 20mins (same as what it was after 30mins)

[Peek-a-boo]

Thank you!  This is very helpful.