Just to let you know, it's "high", not "hi". Anyway, it depends on the person (tolerance, weight, etc). I'm assuming you're new to smoking, since you're asking this question, so I'll just go by that. With low grade stuff, you could probably get high after 4-6 hits, with mids it could probably hit you after 3-5, and with high grade stuff you could get blazed after 1-3.
Depends on who the smoker is, for me, if it's some fire, maybe 4-6 hits. I've seen people hit bongs 4-5 times and still not be high, but have a buzz.
Maybe you should get to a 5th grade level of grammar and spelling before you start smoking so you don't give weed a bad name.