How long should I expect soles to last?

I've got myself a pair of Solovair chelsea boots about a year ago and the soles are already pretty worn out. Water gets through the sole so I probably have to resole them if possible.

The wear has been surprisingly fast. Most of the boots I've had have been cheaper price point and lasted at least few years. Do I walk wrong or are the Solovair's soles just bad? How long should the soles last?