How many years apart?

Accacia

How many years did you wait to have your second child?

I am only asking because once we get our own house, my son will be about 2.5 yrs old and about that time we were thinking of ttc again for our 2nd. Would you think that 2.5 or 3 years apart would be a good distance apart, or should I wait a bit more? Or what's your distance number between siblings?