I've spent today completely by his side to make sure I can get decent nap times and so far he had a 1 1/2 half nap at 8:15 and has just woke from almost a 2 hour nap, he went down at 12.15.
I've found 2.5 hours is the max I can keep him up at the moment, he went into complete meltdown before his nap.
I'm now confused about the next nap though, he definitely cant go till bedtime and should be ready for another sleep just before 5?