Ive never really kept record but i know i feel bubs quite alot and then there are times i dont feel anything, when he must be sleeping. If time goes for a bit and i havent felt anything for longer than usual, i just kinda poke my tummy lightly and within a minute or 2 hes up and riggling again.
Like the others have said,i dont think theres a set amount, every babys different and they lie in different positions..