Few thousand USD. I trade when I can. When I'm off work I day trade, other than that I hold positional trades for a week to two weeks. I'm not a long term buy and hold investor.
You can't make a ton of money with just a few thousand unless you risk it all on options. To make a living doing this you need at least 25,000 in starting capital, then you could make money if you're good. Most aren't good enough.