Soo in general how much should one invest in Bitcoin should it be "how much you can easily invest without stress " or "as much as you can invest at all cost"
Although I am aware it isn't a do or die affair
In all the cases it's better to invest without stress, as for amounts invested with stress, it turns every such investment into a gambling. So if you like gambling, you can afford investing a bit more than just excess money you otherwise would collect. The certain no go is to borrow and invest the borrowed money, since cryptocurrency is predominantly long term investment, and paying the debts is not a good option...