While I wasn't able to find specific regulations about the use of shared safety harnesses by multiple workers on different dates, here's some general guidance regarding the use and inspection of safety harnesses:

When using shared safety harnesses, ensure proper fit and conduct thorough inspections before each use to comply with safety standards. A worker shall ensure that the full-body harness is properly adjusted to fit the worker securely before each use LLMCitation(cited_text_snippet= [1]

and inspect the connecting linkage, personal fall arrest system, full-body harness or lifeline before each use LLMCitation(cited_text_snippet="An employer or contractor shall ensure that a worker inspects the connecting linkage, personal fall arrest system, full-body harness or lifeline before each use", [2]

to identify any defects or unsafe conditions.