Tax question about short term losses vs long term gains

[rockrock]

If I want to tax harvest my investment account (short term losses) how much can I deduct from long term gains?

In other words if i want to sell long term winners can I offset that against short term losers?

I read somewhere about only being able to deduct 3k against income but that doesn't seem like much - how do day traders handle their taxes?

Must a be a nightmare.

Any help or insight appreciated.