As said FOs who work it can make as much as a reserve captain.
The FOs who enjoy their seniority while they have it can upgrade and see an 80% increase in check size. And that is not killing yourself either.

It is a huge spread of possibilities.
If you have been killing yourself and plan to keep doing that then roughly guess your % gain in check size will be the same as the % gain in hourly pay. There's your answer.