Depends on to what use you'll put the water from the well.
If it's only going to be used for irrigating a lawn or garden then the use of what we call "surface water" here in the U.S. is a relatively simple process. One can do it in about 2 hours, depending on the depth. Surface water ( a misnomer, of course) extends to about 50 feet but depends on a number of things. Surface water should never be used for human consumption of course. That type of well can never be more than about 30 feet deep in any case, thanks to the laws of physics.
For deeper wells, especially if the provided is water intended for human consumption, a "short hole" (about 10- 25 feet deep) is drilled (actually pounded), the drill stem removed and the hole filled with concrete. After a day to allow for the curing of the concrete, a hole is then drilled through the concrete and "cased" (lined) with steel pipe as the hole descends. (This keeps the contaminated surface water from draining down to the 'good' water).
Here in the western U.S. most wells are usually 150' to 250' deep, but obviously depends on geology.
One word of caution... if you're property is smallish, under and acre, say, (our ranches out here are several sections large) the drill stem on a deeper well can actually bend and wind up under someone else's property... not a good thing legally speaking...