It doesn't matter if the market is up or down. There are always going to be certain stocks with momentum getting ready for a profitable breakout, either in pre-market hours, regular market hours or in the after hours session.
Profitable trades can take anywhere between 3 and 30 minutes. And in some occasions You will be able to ride a very good stock for a full day or more.
The problem is that if you don't know how to pick those stocks and manage the trade while limiting your risk, you won't even get close to making a few dollars.