Yep, most of the CF cards I own give lifetime guarantees, and write cycle guarantee at 100,000+ and they are old. A modern card will give you 1m writes. Of course, yours might last well beyond this.
Also, they have 'wear level' tech which stops the same cell being written to over and over.
To put this in perspective, if you sat there and clicked 'write to cell' once a second for 24 hours, that would still only be 86,400 writes.
