2010 F150 impella replacement

[cruiser54]

Hi,
Just a general question.
When should the impella be inspected/replaced?
My motor is new with only 50 hours but I want to know if the impella should be replaced at the 100 hours service or beyond.
I thoroughly flush the motor after every use via the flushing port for at least 15 monutes (as per Yamaha instructions).
Is it premature (dealer overservice) to replace the impella at the 100 service?
Under my operating conditions should the impella last say 200 -300 hours?
Thanks.

[rodbolt17]

book says once a year or every 200 hours.
I typically do them every 200 hours or every other year.

[cruiser54]

Thank you Rodbolt17 for your advice.
Cheers.