Some of techs at my job were talking about how they will be on a job and let's say 35 hours were budgeted for the job. The 35th comes around 3pm if the tech stay till 5 and make sure everthing is perfect they will have spent 39 hours on the job. Now the techs didn't have any jobs in the area and would end up going back to the shop and those 4 hours 2 hours per tech . Were not billed out . Is there a hidden cost or reason to have the tech come back to the shop instead of stay at the job and make sure things are perfect.

I'm asking because I'm not an owner and might be missing something . But if we didn't get paid for those 2 tech for the last 2 hours of the day wouldnt it be better to have them work in the field instead of at the shop.