The question is rarely whether a job can be done. It is whether it fits before ETD.

Afloat repair work is constrained less by capability than by time. Most jobs on a defect list can be done. The question is which of them can be finished inside the port stay, and that has to be answered before the work starts rather than discovered halfway through.

The useful discipline is to split the defect list in three: work that must be completed this call, work that would be sensible to do if the schedule allows, and work that can safely run another voyage. That ordering is a technical judgement about consequence and risk, not a budget exercise, and it is best made jointly between the superintendent and whoever will actually be doing the work.

Cargo operations complicate the picture. Hot work is restricted during certain cargo operations, and access to spaces depends on what is happening around them. A job that takes six hours of labour may need a twelve-hour window to fit around those constraints.

Scope growth is normal once machinery is opened up, and the right response is to reassess the fit immediately rather than at the end of the shift. If the additional work no longer fits, the options are a riding squad continuing at sea, or closing up and planning properly for the next call. Both are better than a job left partly complete with the vessel due to sail.

Prefabrication ashore is the most reliable way to buy time. Pipe spools, brackets and steel sections made up before the vessel berths convert on-board hours into shore hours, and shore hours are not competing with ETD.