A straightforward torsion spring swap, once we've got the right size in hand, usually runs under two hours on site. Doors from Dunbar's 1950s-60s stock don't usually complicate that timeline on their own - the hardware is simple, just old. What adds time is a bearing plate that's rusted into the bracket, or a shaft that's bent from years of an unbalanced spring dragging on one side, which we do see more often on houses built before torsion hardware was standardized.
We won't quote a same-day guarantee here, because we're coming from Charleston and Dunbar sits about six miles out - close enough that it rarely changes the schedule, but we're not a local branch with a truck sitting idle nearby. If a part isn't one we carry, that adds a day. We tell you that up front instead of promising a window we can't hold.