One day covers most residential replacements here, including the pull, the set and disinfection. Water is off for the working part of that day. Depth past 300 ft, poor access, or a well that has not been opened in decades extends it.
The order is fixed and it matters. Electrical tests come first, because a drop wire fault reads at the panel exactly like a dead motor and costs a fraction of one, and Fayetteville Well Pump Repair would rather find that before the hoist comes off the truck than after. Then the well record is pulled for depth, then the well is drawn down for an hour at design flow so the replacement is sized against the well as it actually is.
The pull itself is the slow part, and it scales with depth because the hoist is lifting pump, pipe and the water inside the pipe together. That is the whole reason the depth surcharge exists at $500 to $1,000 per additional 100 ft, and it is why a quote without a setting depth cannot really commit to a duration either.
Two things routinely add a day. A well that has not been opened in thirty years can have a seized pitless or corroded casing that needs work before anything goes back in. And access matters more than people expect: a rig or a hoist needs to reach the wellhead, and a wellhead behind a fence, under a deck or across soft ground is a different job from one beside a driveway.
Disinfection closes it out, then the water goes back on. A sample follows after the chlorine has cleared rather than while it is still present, since testing during treatment produces a clean result that proves very little. Replacement covers the work itself, and shock chlorination covers the closing step.
Related questions
Will I be without water all day?
For the working part of it, yes. Filling containers before the crew starts is worth doing, and on a normal well the supply is back the same evening.
What makes a replacement take longer?
3 things: depth past 300 ft, access to the wellhead, and a well that has not been opened in decades. The pump itself almost never sets the duration.
Can it be done in one visit in an emergency?
Often, where the diagnosis is clear and the depth is normal. The electrical tests happen first regardless, because they decide whether a pull is needed at all.