Rachel I find that DS's A time is really unpredictable and sooooooo much more than before, it depends on what he's been doing for that A time.
We do 3.5 hours in the morning before first nap, shorter if he's had a good tiring jump in his doorway bouncer (mommy trick)
Nap 1h15 to 1h30 min
Afternoon A time is 3h45 minutes USUALLY, sometimes can be 15 minutes shorter or longer
Nap 45 min to 1 hour
Before bed A time is 3h30 to 3h45 depending on his naps.
He then does an 11.5 hour night.
Also If I have to wake him from one of his naps, I find that his A time is shorter than if he woke up on his own.