I typically will just bike to my errands on lunch. My cage was in-op for two weeks due to brake caliper failure recently. Ended up biking to the UPS store on lunch when the ebay recycler sent me the wrong part. That same day after the UPS store, I manged to hit up my bank, and a local pizza place, and get back to work with enough time to shower. This was over the course of an hour.

I've also worked things out with my manager when I have to leave early to get something done. Usually will plan on getting to work earlier, or working a 30 minute lunch vs our normal hour.