Walkin...

So yesterday i went for a walk in the evening, and ended up strolling for the better part of two hours. here's my issue. when i'm walking on the beach, 1) i don't want to turn around and walk back along the same path i've been going in the opposite direction, and i can't determine what a good amount of time is to walk. 2 hours feels about right - but it is a significant perambulatory commitment. any suggestions on how i can improve my efficiency?