Luckily, troops were not expected to serve entirely in the front line. They would rotate between the three lines: the front line, the support line, and the reserve line, and then spend a short period in rest, before beginning the cycle again. The time spent in each section varied from sector to sector. In busier sectors of the war, soldiers would spend far longer in the front line than usual, and less time at rest than usual. In a year only around two months would be spent at rest, and not typically at leave. In a year, perhaps two weeks would be spent at leave— if a soldier is lucky.