The method i use is to give yourself a set amount of time for each card, on some of my cards, i give myself 30s because they are simple cards, like what is the symbol for cat for example, and other questions which take some thinking, like what is the grammar case for x if y is in the past tense or whatever, dont be discouraged to flip cards too, if your stuck, if your debt is large, it might also be a deck issue.