DS PT around 2 yo He is now 5.5 yo and still soaks through his Goodnights.
DD PT when she was about a little over 3 yo. She has been dry both day and night pretty much from the first week she PT'ed.
With DD, I had planned on waiting until she was dry for a few weeks before stopping pull ups at night but after a few days she asked to not sleep with them on so we stopped. I'd see if she is consistently dry for at least a few nights and then consider no pull ups at night.