For as long as they maintain their qualification and fitness level, paramedics can practice for as long as they like. Some institutions or organisations may require paramedics to be healthy, fit and within an age bracket (typically between 18 and 65).
A few hours
Hair bleach does not stay active for very long once it has been mixed. It begins to lose strength quickly and should be used within an hour.
For ever. Sorry.
Electronic Patient Records will stay active on a server as long as you are a patient of the person recording your visits. If you change doctors you may request that your records be sent to the office.
No, a substrate with low affinity will not stay long in the active site of an enzyme. This is because substrates with low affinity have weaker interactions with the active site compared to substrates with high affinity, resulting in quicker dissociation from the enzyme.
Arrest warrants are valid until served or recalled. A warrant can remain active indefinitely.
1 hour
Traffic warrants stay active until they are served or satisfied. You may need to bail yourself out to avoid being taken in on a warrant.
Wolves are very active animals. Hunting, running, walking, and playing is how they stay active. It's rare to see a wolf stay in one place for a long time.
i thought 6 months
Roundup, a common herbicide, typically remains active in the soil for about two to six months after application.
The paramedics are here.