Throughout, I try to pick conservative numbers; and it's more conservative to value my time at a lower bound like minimum wage than what I'm actually paid since working is not always a live alternative.

(Although I'll admit that in this case, it would probably be more conservative overall to value my time at a lot per hour since it makes each experiment more expensive and less likely to be worth running. I didn't think a whole lot about the minimum wage assumption. Usually I'm discussing the value of time gained from the use of melatonin or modafinil - where the time value applies to the possible benefit and hence the more one's time costs, the more likely melatonin or modafinil is worth the money...)