The Primitive Methodists demonstrated wisdom in their scheduling of prayer meetings. They recognised that their constituency consisted of working men with demanding physical jobs.
Accordingly weekday evening prayer meetings lasted for about an hour and a quarter, and they were quite deliberate in not letting them continue beyond the allotted time. As working men, they felt it their Christian duty to be fit for work the next day.
There is a wise balance between zeal and balance here. Sometimes unwise zeal causes us to “burn the candle at both ends”. Whilst that may be fine in the short term, it is not usually sustainable in the longer term.