20 pips is enough when the lot size is more than $1. so not, it is too much less for a trader. but i think for the new trader, 20 pips is enough initially. because at first time forex market is risky for the new trader. at that time they have a few knowledge about forex trading. so they should take little lot size and earn few pips in a day. but after acquiring good knowledge the new trader can earn more than 20 pips per day.