15 minutes to get to 380?

I am using the top and rear element and it took 15 minutes to get to 380. Is that normal?

Last week I was baking focaccia and the temp acted odd. It was at 475. I opened the door to put in the bread and the temp dropped of course. But then after closing the door several minutes later the temp was below what it was when I opened the door.

The oven fan makes an odd sound almost every time I start it.

On the 380 cook after 48 minutes the timer display showed 1 17:30. I had no timer set so that was odd also.

The fan in my new oven is also quite noisy. Is this natural?