Elmer, I would not worry my head about it as they make plenty of 7mm barrels in the event you are lucky enough to wear one out from too much shooting
The fastest I have had a barrel go was a Shilen chambered for 280,in about 600 rounds(!);that was very unusual and your 7 mag could likely go a couple thousand before it quits...it all depends but the point is don't sweat,just shoot and enjoy it.It can always be replaced.
