The Easy Off oven cleaner should begin working on the food residue or grease in the oven within an hour or 2 hours after applying the Easy Off oven cleaner to the oven.
Before using the Easy Off oven cleaner in your oven be sure that the oven has been turned off and is cooled down and then spray the Easy Off oven cleaner into the oven and allow it to sit for at least 2 hours.
However it cleans the oven best when you let the Easy Off oven cleaner stay in the oven overnight as it really gets the oven clean overnight.
Then you just wipe the oven out with a wash cloth to clean the oven cleaner off the inside of the oven.
If you have just a little bit of grease or residue in the oven you can clean it up within 30 minutes.