should say on the pack depends on the size etc. mine i only have to charge for 4 hours and then it lasts ages. Ye you have to be persistant when bedding in. once it reaches the point where it wont actually start youll need to retune according to the manual and up ur fuel. You wanna be idling at least 5 tanks. a lil tip if its being shitty when trying to start it. Grab a hair dryer and warm up the engine beforehand. Make it so its warm to touch including the exhaust. I guarantee itll start alot easier after that. unless something is severly messed up.