** I do not have a manual for my oven, I don't know how old it is. I want to clean it, but I don't know how to use the self cleaning oven button. **

The age doesn't matter, what is important is its *model number*.

You can find tips for locating the model and serial number identification tag on your appliances in the 'Repair Parts' section of my web site linked below. Once you get that, you can find links to owner's manual resources in the 'Home Service' section of my site.

** How long should it take? **

Depending on how dirty the oven is, a self clean cycle should usually be 2-3 hours.

JFYI

Dan O.

www.Appliance411.com/?ref411=Frigidaire+Range

The Appliance Information Site

=D~~~~~~

where is the model #