Most doctors recommend that the maintenance phase should last for no more than 1 month. Normally, for most weight lifters after 1 month there are no extra benefits of taking creatine. After 1 month all the creatine you eat just goes to waste. The weight and muscle benefits which you have gained in that 1 month can be easily maintained through training . Many people do cycling . they take creatine for 1 month, then go off for several months, and then again start taking it. As of now, nobody is sure for how long it is safe to take.