When another inch burns off the ruler, it's ready to go.
From the submitter:
Cheap landlady wont fix broken stove. Front panel with handle falls off everytime you pull it open, so, I FIXED IT. Doesn't stay open by itself, slams shut without weight of front panel, so you have to stand in the loop to use both hands to remove pans. Zip-ties, old potholder, and a carabiner and dog chain from the bondage drawer. :D