Pokeygirl,
35 strips to a dull blade is not normal.
Here are some questions:
1. What mat are you using under it? Certain mats are much harder on blades than others.
2. What brand of blade are you using? Brands other than Olfa often can be duller or dull more easily.
3. Have you ever cut paper/cardboard with this particular blade? Sure way to dull any cutting implement.
4. Is there a possibility someone has used your blade without your knowledge? Fie on them!
make them pay up with a new pack of Olfa blades!
Jan in VA