I can't find a definite answer as this seems to be some gray area in the ruling. What would be cool is to spend 24 hours casting hallow on yourself, covering a 60 ft space with an affect, darkness for example. If you are a shadow monk, you could teleport 60 ft in any direction as a bonus action. Potentially surprising a creature as one way to use this or grapple an enemy while you can fly, teleport 60ft up and release.
You touch a point and infuse an area around it with holy (or unholy) power. The area can have a radius up to 60 feet, and the spell fails if the radius includes an area already under the Effect a hallow spell. The affected area is subject to the following Effects.
Most spells have ranges expressed in feet. Some spells can target only a creature (including you) that you touch. Other spells, such as the shield spell, affect only you. These spells have a range of self.
Spells that create cones or lines of effect that originate from you also have a range of self, indicating that the origin point of the spell's effect must be you.
Once a spell is cast, its effects aren't limited by its range, unless the spell's description says otherwise.
A typical spell requires you to pick one or more targets to be affected by the spell's magic. A spell's description tells you whether the spell targets creatures, objects, or a point of origin for an area of effect (described below).
You select a sphere's point of origin, and the sphere extends outward from that point. The sphere's size is expressed as a radius in feet that extends from the point.
A sphere's point of origin is included in the sphere's area of effect.
I've seen several answers saying that the hallow spell cannot move, but how I see it RAW you can cast it on yourself.