The amount of times you can pee in a disposable diaper before it leaks depends on how much capacity the diaper has.
Lower end low capacity thin diapers may only take 1 to 3 pees before you need to change or risk leaking but higher capacity thicker disposable diapers can sometimes take up to 6 to 8 pees depending on how much you pee at a time.
I always just pee when I feel the urge and never let it build up to the point of my bladder hurting so I just go pee as my bladder gets filled up.
I tend to get at least 8 pees into a high capacity thick diaper like the ABU Little Pawz diapers or any other line of ABU diapers before it starts to leak and that can take me all day or nearly all day to fill up a high capacity diaper like those.