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Hi,
I wouldn't worry to much at the moment about the cycling. I competed in IM UK in 2007 and didn't have a turbo trainer therefore only really managed to get out on Sundays for long rides the course was hilly but I didn't have any real problems with the amount of training I managed to get in. That said if I understand your post correctly you have a turbo, therefore are in a much better position, I bought a turbo in 2008 and am now using it mainly for my training during week days. I would suggest if you cannot get out due to weather condition just make sure you use the turbo. Using this will give you a much better controlled workout than just going out on the roads.
For what it's worth I would continue to use the turbo during the week keeping within your heart rate zone 2 this is completely controlable on the turbo and save the weekend (sat or sun) for a longer ride. At the moment I am only doing a maximum of 4 hours bike turbo and sunday ride, this will increase after my first 10 week block then on the second 10 week block will increase to between 5 and 8 hours per week, then the next 8 weeks increasing to a maximum of 10 hours per week this will then allow for 2 weeks tapper. Don't forget you need to balance running and swimming into the training and therefore not overdo the bike.
In my opinion it is more important to get the training levels right and within the correct zone to ensure you increase your arobic ability if you take care of this you will naturally increase in speed and also help to reduce the risk of injury.
Hope some of the above helps all the best with the training Dave |