If you have diabetes your doctor will tell you how often you should check you sugar levels one test they do is A1C test that is done once every year your doctor might have it done a little more.
Diabetes
Fire extinguishers should be inspected annually - by a suitably qualified person.
The gemstone that is often confused with diamonds is called a cubic zirconia. A person should have their ring checked by a jeweler if they suspect it's a fake.
DailyDaily
monthly
Commercially speaking, in the UK they have to be checked annually, and signed.
brake linings should be checked at 15,000 and 25,000 miles and then every 5,000 miles after that.
The frequency a person should check their bank debts varies from person to person. Some people choose to check them daily. At minimum, they should be checked monthly to make sure payments and transactions are correct.
Every time it is worn!
With each brake job.
Every time it is worn.
Every time the PFD is worn
every 4 weeks in the community