How long will a rod bearing repair last if I don't turn the crank?

It depends on how much damage was done to the crank. If the journal is smooth and mics out as still round and close to original specs it will last just as long as a crank that has been turned. If you actually spun a bearing then you can bet that the crank journal will no longer be round and putting a new bearing in won't last long at all. You can pick up a mic gauge really cheap at harbor freight. The cheap ones will be plastic....and though they aren't as good as the professional ones, they will take fairly accurate measurements.