Grow long hair in 1 month?

Are you refering to head hair, pubic hair or body hair? I have just had a quick search around the net and the average growth rate for head hair seems to be around 1cm (approximately 1/2 inch) per month. I did not find any references to the growth rate of pubic hair or body hair. This is probably because there is an initial growth spurt in both during puberty. Afterwards, although hairs fall out and are replaced by new ones there is little change inthe overall length of the hairs. Although your rate of 1 inch per month is greater than the average growth rate for head hair you should remember that averages are just that, averages, and there will always be many people whose hair grows either faster or slower.