The time required for a shower to regain hot water depends entirely on the root cause of the temperature drop. If the water heater tank was simply depleted from a long bath or prior use, it typically takes 30 to 60 minutes for an electric or gas water heater to fully reheat a standard tank. If the issue is a misadjusted anti-scald limit stop or a stuck cartridge valve, hot water can be restored instantly once you adjust the trim or replace the part. Verification: Test the shower temperature after the reheat cycle or adjustment to confirm hot water recovery.
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