11 months is plenty of time to get yourself trained for that!
However, you do have to be careful not to hit the training super hard for the next 8 months only to fizzle out in the final lead up.
Generally, for someone in your position, I would recommend going with a reverse periodization scheme. Meaning, spend the next 3-5 months (depending on how bad your winters are) focusing more on the shorter efforts and muscular endurance work (GOAT, POWER STATION) but keeping the volume low to moderate. Then in the 5-6 months leading into the event is when the millage starts to increase, and the frequency of high-intensity sessions decreases substantially (but does not go away completely!).
This ensures that you have a nice high aerobic ceiling to build under. The muscular endurance work will enable you to increase your mileage a bit more rapidly once you switch over to that phase. And on that note, I would strongly suggest adding strength to your training program for the next 24 weeks. The added muscular endurance, stability, and core strength gained from strength are going to be vital to get you through that long of a day.
For plans to start now, something like the Metric Century or Time Trial Prep plan w/ strength would be a good starting point. Don’t start going crazy with adding volume right out of the gate.
I would also suggest looking into a SUF Coaching customized plan, especially if you are going to be putting in all the hours needed to reach your goal.
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