extends
v.v. to make something longer or larger, or to cover a wider area. You can also use it to describe how long something lasts in time.
v. to stretch out or draw out to a full length; to increase the scope, duration, or physical reach of something.
The new highway extends all the way to the coast.
The university decided to extends the deadline for applications because the website crashed on the final day.
The influence of the Roman Empire extends far beyond its historical borders, shaping the legal and linguistic foundations of modern Europe.
The verb is transitive when it has an object, but it can also be intransitive to describe a physical reach.
The road extends for 50 miles longThe road extends for 50 milesThe verb 'extend' already includes the idea of length; adding 'long' at the end is redundant.