One of the rules of thumb I have heard is to get at least one ride in that is at least 70% of the length of your target.
You have made that, so the rest is gravy!
Just keep working, and as said earlier, take it easy and stay hydrated. With two months left to go, you may actually even accidentally get in a 57 mile ride before then if you keep at the rate you are going.
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Slow Ride Cyclists of NEPA
People do not seem to realize that their opinion of the world is also a confession of character.
- Ralph Waldo Emerson