Why 48 hours
The EPA advises drying water-damaged areas and items within 24 to 48 hours to prevent mold growth (EPA guide). Carpet pad, drywall and insulation soak up water quickly; the longer they stay wet, the more of them has to be cut out. That's why a restoration contractor will usually start with extraction and drying equipment and leave the rebuild until readings show the structure is dry.
If you plan to make an insurance claim, the Ohio Department of Insurance says to notify your agent or company right away, make the temporary repairs needed to prevent more damage and keep the receipts, and keep damaged property until the insurer says it can go (ODI homeowners guide).

