Best of luck. You'll definitely want to be completing 100km rides by the time the event rolls around. Remember also that working with other cyclists in a pack will really help. Slogging out the distance solo will be a lot more work. In competition packs, only 40% of the energy is used, compared to doing all the work.
In terms of bikes, be careful purchasing anything 2nd hand, as you can end up inheriting the issues, and depending on budget, end up costing more than something new on special. On that note, never pay RRP

The mountain bike will make the riding harder (you probably know that), but then, for improving fitness, that's not a bad thing. Try to find the fun in the riding, as doing it purely for fitness will be a struggle to keep motivation going.
Used to road team time trial over a decade ago, and got into bicycles again last year, but this time mountain biking. Good for fitness and the social aspect

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