Burak:
Give it a day at room temp (70-72F) to do the initial cure. After that, it's safe to start color sanding.
For example, at my car club meeting this month we had a demo on how to correct problems in paint - orange peel, dust and trash in the paint, runs, etc.
The parts were painted in the Morning and air-dried (no heat room) at room temp at the body shop.
We all arrived around 6pm and the demo of color sanding started at 6:30pm (1000, 2000, 3000 grit wet paper, then 3M 3-stage compounding with a rotary buffer). The paint worked beautifully and looked like a show job when done.