Do the Community Stab/RSCU authorization, do they have to be submitted by the requested start date or they will be considered late?

Community Stab:

"The continued stay service authorization request must be submitted no earlier than 48 hours before the requested start date of the continued stay."

RCSU:

"If additional activities beyond 5 calendar days/5 units are clinically required, the provider shall submit an authorization request to the FFS contractor or MCO through a continued stay service authorization request accompanied by a CEPP submitted no earlier than 24 hours before the requested start date of the continued stay. "