I bought my gpus for 400$ and they produce 31MH each, hope I'm on the safe side? 120 to 150 days is all I need to recover my most ROI, it's definitely going to be a disaster if bear season really kicks in right now
Well alot depends on what GPUs you bought and your power costs like Metroid said. If you got cheap power you can keep mining longer than someone with expensive power. However keep in one thing. Usually when it reaches the point where 50% of your profits go towards your power bill, the profits aren't great either if you got very cheap or free power.
Another issue is what GPU did you buy for $400? Is it some new Nvidia or AMD gpus or did you pay $400 for an RX 470 8GB GPU which was released almost 5 years ago. The RX 470 8GB are very inflated in price right now, people are selling them for $300-$400. However just a few months ago they were worth $125-$150. So if you overpaid for this old GPU then it might take a while to ROI. However if you bought some newer GPU at MSRP then you can always resell it to a gamer and most likely make a little profit if things start to turn bad soon.