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I'm hoping it might be possible for a little advise and perhaps some perspective.
I race mountain bikes at a high level, but I am considering a new challenge and thinking about a marathon.
I run 1-2 times a fortnight, only up to 40min or so, both on and off-road. I can hold low 4min km for a time and my longest ever run was an off-road 1/2 in 2hrs over 1 year ago. Normally I don't run over 8km.
Realistically how much training would I need to do in order to run a sub 3hr marathon and how long would it take me to get up to those distance?