What to know about the traditional high-temperature self-cleaning method
"The traditional self-clean with a high-temperature burn is typically adjustable in time from 2 to 4.5 hours depending on the soil level in your range," Green says. "This type of cleaning can be smelly." Temperatures get as high as 900-1000°F to burn off the food residue, which leaves ash in the bottom of the oven that can be easily wiped once the cycle has ended and the oven has completely cooled. Don't ever leave anything on the top surface during a high temperature clean as certain items may melt. Also, don't block the oven vent during cleaning.
9 Things to Know Before You Self-Clean Your Oven, Source:https://www.rd.com/list/self-clean-oven/