Three for us, but it's totally hormonal and nothing you can control. So I really wouldn't worry about it!
My little boy is 4 and is inconsistently dry so we use pull ups. His cousin was 5 years 11 months, but apparently I was 2. It will happen when it happens!
He started 3yr old kinder fully trained, trained at 2y3m. My girls were actually earlier than him
My eldest still isn't dry some nights and she is 4, my youngest dry from 2 years and 5 months old.
When he was 2 - we were very surprised but he just stopped wetting soon after we potty trained him. He’s 2.5 now and hasn’t wet overnight in months