running vs cycling fitness

At the momemnt I'm purely a runner and have no ambitions to be a triathlete as I swim like a brick!

However.......the idea of bike/run duathlons appeals to me (particularly off-road) and I wondered how my level of running fitness would transfer to cycling. I don't want to do loads of cycle training cos I don't want to interfere with my running.

Can I put in a reasonable performance on a bike based on maybe one cycle session/wk plus my usual running programme (50ish miles/wk) or will I have do do more cycling?
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