[waterlesscloud]

Having worked construction jobs, a lot of it is waiting. Waiting for someone else to finish their job, waiting for materials to arrive, etc. While it could sometimes be non-stop (once what you were waiting for is done, now someone is waiting on you), even then you'd pace yourself. No one goes all out for 16 hours.

[cptskippy]

That sounds surprisingly like my job with the exception that sometimes I do actually go all out for 16 hours.