It depends about what your schedule looks like. And what you prefer between spending 20 to 30 minutes of scrubbing in the morning or in the evening. So if you want to scrub it in the morning then you should start cleaning your oven in the evening, just before going to bed. Because you need to spray the oven cleaner and let it sit overnight for some hours. Or you can spray the oven cleaner in the morning and then scrub it in the evening when you come back from work.
