Drastic Increase in bike time/miles

It's somewhat amazing that people plan to do longish events, then think they can wait until a few weeks out to start training. Kinda like cramming for a test. The difference is that the body typically doesn't respond like that.

However, it is what it is and the best you can do at this point is to start getting in some biking mileage. Maybe a daily 10-15 miler and a longer ride on the weekends 50-70 miles. If your event is some sort of charity thing you will likely have the opportunity to get off your bike at numerous aid stations. Take advantage of that to stretch out some, especially your neck and back. The legs may be able to handle the mileage, but the neck and back can get really sore when they haven't been properly adapted to long rides.

Have fun!

I cannot cite you a source, but I have read that the 10% increase per week rule that applies to running does NOT apply to biking.

I think the rule is in place to keep your body safe and adjusted to all the pounding that runs inclficts on your joints.  Biking does not have that same effect, so, as long as your bike is properly sized and fitted to you, you should be ok.

It all depends on your overall cycling base.  If you have been doing it a long time, then you can usually get away with ramping it up hard.

For my IMLP build I went from doing at most 40 - 50 mile rides right up to 4 consecutive weeks of 100+ mile long rides with a few shorter mid week rides thrown in.  I guess you could say I jumped about 200% or so in one week and just held that ........

I think a sudden large increase in your cycling volume is typically not going to harm you, assuming you have good form and provide your body with the necessary hydration, calories, and electrolytes. I've done 24 hour races and the Tejas 500, as well as completed an 11,000 mile tour in five months, so I have some background with high volume riding. I say go for it.

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