This depends on what size you have. Some tampons that allow for more volume to be collected can be left in for 4 to 6 hours. If you are using a smaller tampon and have heavy flow, you may want to...
Changing the print cartages for your printer should be done whenever the ink amount is low. However, replacing or changing your printer should be done every 4-5 years at the most, or whenever your...
It depends on the type of driving. If it's heavy "stop and go", you should probably have the brakes checked every 10,000 miles; on the other hand if it's mostly freeway you can go 50,000 or more.