I had unlimited from towboat us, I used it last year and it saved me 750 for one tow. They charge by the hour from the time you make the call, no matter how long it takes them to get to you.
Reminder, if tied to your dock and you need a tow from Boat U S untie boat from dock and push off and anchor or they may charge you 50 bucks. The guy was pretty nice and did not charge me the 50 bucks. Had to be towed from my dock to the marina
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Things done at the last possible minute are done with the greatest possible information. Procrastination is, therefore, the most efficient means of doing things.