How often does a blade drive need replacing?
One guideline is the rule of 5. If a clipper is used to clip an average of 5 dogs, an average of 5 days a week, the blade drive may need replacing every 5 weeks.
Blade drives by different brands, and different models by the same brand, will wear at different rates. Clipper manufacturers normally recommend changing the blade drive from monthly to quarterly depending on use.
4 weeks to 4 months is such a broad guide because varying factors like frequency of use, coat type, coat condition, cleaning, blade and clipper maintenance, can all impact the speed a blade drive will wear down.