Bringing stove up to temperature - question

In the morning first thing I do is kick off a new fire. I have a magnet thermostat that is attached to the outside of the Quad 7100. Usually it still is around 200-300 degrees. I still have lots of big glowing coals from the previous night. I reload with some kindling and 3-4 smaller splits, get ready for work (25mins) come back down and its usually up to 600 degrees. I back off the air and head out for the day.

Is jumping from 200-600 degrees in 20-25 mins too fast? Will it do any harm to the unit? Do i need to gradually bring it up? Just wondering.

Hope not...

That's basically my morning routine.

Steve