The tank refills to the outlet within a day or two of normal use, which is correct and not a sign of a problem. A brief odor as the lid is opened is normal. Water use can resume immediately.
More detail
Two normal outcomes worry owners unnecessarily. The first is refilling. A pumped tank is designed to refill to the level of the outlet pipe, and normal household use gets it there within a day or two. That is the working level, not a leak, and not evidence the pumper left something behind. What would be a problem is refilling above the outlet, or the return of the original symptoms within weeks, which points at the drain field rather than the tank. The second is odor. Opening a tank releases gas, and a smell around the access lids for a few hours afterward is expected. An odor that persists for days, or one that appears indoors, is worth a call, because it can indicate a dry trap, a disconnected vent, or a lid that was not resealed. What to ask the pumper before they leave, while the tank is still open. Whether the inlet and outlet baffles are intact, since a deteriorated baffle is inexpensive to replace at that moment and expensive to discover later. Whether an effluent filter is fitted and whether it was cleaned. What the sludge and scum depths were, which tells you whether your interval is right. And whether the liquid level was above the outlet when they arrived, which is the drain-field tell. Those four answers turn a pump-out into an inspection at no additional cost, and they are the basis for setting the next interval rather than guessing at it. Lid safety is the one hazard worth naming: a tank lid must be secured after service. Septic tank lids are a genuine hazard to children and pets when left loose or damaged. A local scheduling note. Pumpers across Greater Columbus and Central Ohio run hardest in spring and after extended wet spells, when field problems surface all at once. Booking routine service outside those windows generally gets a better appointment and an unhurried look inside the tank while the lid is off.