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Your base fitness will get you through. I'd focus on doing tempo type bike sessions, so not super high intensity but do 20-30 minute intervals at tempo, so approx 30-35 bpm below your max heart rate, and do 2 or 3 per session with ten minutes easy in between. They work well to build endurance, which is what you probably need to focus on.
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How best to spend my time...?
Riding.
Up and down hills.
Every spare second you have. Do some of it hard enough that you want to stop.
Accept no substitute.
Are you carrying gear? Ride with that attached.
Turbo training might get you some extra fitness but if you've done fuck all riding, you're better off getting more comfortable descending in all weathers with a bike setup matching your ride setup. If it's not a race then you don't even need fitness. But if you crash because you're a gumby on the descents, your ride will be a lot slower than if you'd done no training :)
I posted this on the running thread but have been pointed to here....
Over the past couple of years I have built up some decent running fitness but have had little to no time on the bike. I have a hilly multi day ride (2000m,140km/day 3 days) planned in for early September. I have about 2 x 1hrs and 1x 2hrs a week where I can train. How best to spend my time...? Bearing in mind I've never actually "trained" before when it comes to a bike...
It's not a race, but I also don't want my legs torn off and want to enjoy the evenings and getting back in the saddle.
I live nr hills and have a turbo, but would rather be outside.
Any advice welcome. Ta