[naavis]

This I agree with. But I would say being available to help and support and whatever is part of the job. If you say you work for 4 hours, but still have to be available for all of the above for 8 hours, you are working for 8 hours, not 4.

[andirk]

In "agile" or "scrum" or whatever story pointing is, the "level of effort" is often touted and rightfully so. The mind can quickly become exhausted after grueling mental labor. Personally, I often get some 5 hours of solid work in one day and consider that enough. Other times, I'll work 10+ hours in a day on less mentally grueling work but I rarely bill over 8 hours in one day even if it's more. I always want my employer to see the cost of me as well worth it.