I can't be bothered with the clock feature of the in-dash radio. However, I did modify our wall mounted, battery powered clock hanging just over the only door our unit has. While working on it to correct it's constant losing of time, I removed the minute hand completely. Now we have the position of the hour hand, and the second hand ONLY.
Afterall.........when you're RV-ing, knowing that it's somewhere between 2 and 3 o'clock should be enough, without needing the details of exactness. The only time of day that's important is knowing that "it's 5 o'clock somewhere" when it's time for a bevvy or two.