Scheduling the day so the day actually works
A bad schedule is the most expensive thing in the shop. It just doesn't show up as a line item.
Stop double-booking on purpose
The 'we'll fit them in' habit feels customer-friendly and is actually how you teach your team that the schedule is fiction. Hold the schedule. Customers respect the shop that says 'Thursday at 2' and shows up at 2.
Cluster by geography
A 45-minute drive between jobs is a billable hour you gave away. Hold one day for one zip code cluster, the next for another. Customers will adjust; gas money won't.
Leave a buffer block
One 90-minute block per day with nothing scheduled absorbs the overruns. Without it, every overrun cascades into the next appointment and creates a late-customer apology tour.
Take your version of this question further
This is one operator-tested angle on the question. Your shop, your size, your trade, and your team change the answer. Ask your specific version inside Ask a Shop Owner to get a response grounded in how owners like you actually handled it.