you need to test, this is my opinion on the cycle, test ammonia, nitrite and nitrate daily, eventually you will see ammonia and nitrite rise then fall and eventually become zero, during this time nitrate will rise and rise, when ammonia and nitrite has been 0 for 3-4 days then do a water change to dilute the nitrate and then add a cuc, keep monitoring though, the actual time is a total guess but can last up to six weeks, although it can be a lot less