Warranty Work - How long is too long

We bought a used class A, (2002 Itasca 32V) from a local dealer who also has an RV shop in town. We were able to get the dealer to agree to repair several minor issues, however we were set to go on a vacation so brought the MH back to the shop after we went on a 2 week trip. The sales team told us to "check everything out" and let them know when we got back. We found 3 additonal minor issues (a broken drawer slide, a loose drivers side mirror and the windshield washer didn't work). The shop told us they would repair these "new" issues as well as the ones on the due bill. After three weeks of waiting, we were told that the shop was "waiting on parts". Long story short, we talked with the shop techs and found that it is better for us to have them order the parts, then bring the rig in when the parts are in for repair. We've had the MH in for two other minor issues, and both times, they call us when the parts are in, we drop off the rig and in 1 to 2 days it's done. This has worked for us so far, they have been more than willing to work with us on getting the MH back to us asap.