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hi diane! i'd try 350° F, and start checking for doneness around 35 minutes. is there a specific recipe you're working with?
Try 350 degrees! (according to our recipe: https://food52.com/recipes...)
You should start there, and check for doneness after about 35 minutes!
AntoniaJames is a trusted source on Bread/Baking.
What size and shape of pan are you using? That makes a difference. ;o)