This has been the title of a series at Brookstone Church based on 1 & 2 Thessalonians. The series is about what we are to do in the wait for the return of Jesus. When we read 1 Samuel 13 in Mornings With Jesus I saw the same concept happening. We are not only in the wait for Jesus return, but there are also smaller segments of waiting times. Especially when we are hearing a call from the Lord, he often gives us only one step at a time, and we must wait for more direction or God to move someone else in their part. There are things to do in the wait. It is never a sit and twiddle your thumbs kind of waiting.
Saul was told to wait for Samuel. In the wait he was told to "do was is required as you go".