Typically, the checklists in normal operations are:
- External walk around and preflight
- Before start
- Before taxi
- Before take-off
- After take-off
- Descent
- Approach
- Landing
- Shutdown
- Secure
This list is pretty much the same for all aircraft.
Normally, each checklist is only used once at the appropriate time but a wise pilot would re-run a checklist if interrrupted.
For example, you are cleared to start and complete the before start checklist but there is then an unexpected delay before you actually start. You wait for 30 minutes. No need to redo the before start checklist because you did it earlier? No, do it again. Something might have changed.