Daisy Chain/PAS (Personal Anchor System)
My recommendation: the distance should be relatively short (usually between 3 and 12 feet). The closer you are to the wall, the sharper the angle between you and the first piece of equipment. A sharp angle means that in case of a leader fall, you as the belayer will experience an upward pull (vertical) compared to a sideways pull. A sideways pull (horizontal force) is not desired because it pulls the belayer into/towards the wall. Being pulled into the wall bears many risks, such as: sudden uncontrolled stance, increased slack in the system = longer lead fall, tripping over obstacles between belayer and wall, rope burn, risk of letting go the brake and so on. Conclusion: stay close to the wall – guideline 3-12 feet!