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Samuli
I'd love to be riding! I didn't use a trainer before I had a baby. G+T is in the same boat so long rides every weekend not an option, alas!
Re dynamo, it also depends on how strong a rider you are. The higher your power, the lower the loss as a % of what you have. If you are shooting for the podium, a dynamo will cost you less time than it will if you are touch and go for getting to the party. It's only 2-4 hours, so other stuff, like how hard you pedal, faffing / how long you ride for per day and aeroz, will make more difference.