how much you will invest in bitcoin mining and when ?? right now or later and why
Normally I would hear free electricity and jump into it. But I will caution you like I do all new miners. Start and grow slowly, if you start with 10k worth of equipment.... that is a heck of a learning curve.
If you go slower you can learn and work on cooling and other aspects. So buy 1 or 2 and see how it goes. Don't jump in with all 10k first thing being new.
Maybe a couples of S5's to get an idea? People are basically giving them away now, at the current asking prices sellers are demanding for them... Its a bit crazy. Their returns halved, their price dropped by 75%.