Half an hour is not that long. I have to go through 2 drawbridges-one of which is opened at hourly intervals at :40 past the hour. I've been doing this for 40 plus years. Healing my boat is not an option.
We sailboaters have learned to schedule our sailing around the tides, which are normally on a 6 hour schedule. If you are in so much of a hurry that you can't live with a half hour schedule, maybe you should get a power boat.