I agree with you on this. It is not only task based but individual based. When I am at my desk doing tech type work I max out 'productively' at about 30 hours +/- depending on what I'm doing. But when I'm out doing farm stuff I can run 60 or 70 hours without much trouble when on the tractor etc., or a bit less when stacking hay bales.
Mentally tired, for me, is much harder to recover from than physically tired. I'm not saying I want to work 70 or 80 hours a week lifting heavy things, but this type of hourly rating system can be very subjective by the individual.
Mentally tired, for me, is much harder to recover from than physically tired. I'm not saying I want to work 70 or 80 hours a week lifting heavy things, but this type of hourly rating system can be very subjective by the individual.