I'd like to modify my earlier answer.
The electric field is emitted by a charged particle and travels at the speed of light. So, while the volume of an electric field is not fixed and can expand without limitation, there are nuances.
For example, let's say that through a radioactive decay or a particle accelerator collision or some other event, a new charged particle is created. The volume of the electric field will depend on the time elapsed since its creation. So it is possible that it could be as small as you like at a particular time after its creation.