I have been powdering stuff for the past week, i have a temp gun on order, but won’t be here for a while

i was just wondering how long it takes stuff to get to temp. Like i have been doing extra belt covers for my scooter and they are about as thin of cast aluminum as a you can get. I have just been sticking them in the oven for about 30 minutes, i figure 10 minutes to get to temp, and 20 to cure. that about right? Next thing im gonna do is an extra 10" scooter wheel. Its very thin steel. I’m thinking about the same thing, 10 minutes to get up to temp. That about right?

I realize this should be done with a temp gun, but like i said its in transit right now. And these are just spare practice parts, so i don’t care if they don’t come out perfect