I have a convection setting with my oven. Early on I tried it. It worked okay with pizza.I've had this oven 20+ years and don't know what to use the convection setting for. The info book that came with it does'nt give any instruction and I called the manufacturer way back when and they couldn't help! I just don't use convection.
Some things should not have their cook times sped up. There is a place for slow cooking.
I no longer even think about using the convection setting.
