good timekeeper

The train was not a good timekeeper because of the complexity of loading and offloading coaches.

The Cooks were due at eight and John, who was never a good timekeeper, had promised to be home from the studio in plenty of time.

I'm a good timekeeper."

I'm not a good timekeeper in such circumstances, but it's my guess that after six minutes he was still moving in and out of me, slowly, smoothly, as though he didn't mean to stop before next Saturday.

Cold, wet and tired, we pitched the tents, and fervently hoped that Stephen's mother would have reported us missing, as she knew that we were usually good timekeepers and normally arrived when we said we would.