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jakemcree
I’ve not done a 12 min test, but have done 8 and 20’s before. They all do the same thing - give a rough approximation of FTP, so long as you fit the bell curve average and aren’t an outlier.
Don’t worry too much about the number for now. Just ride with the power meter for a while, gathering a variety of data (max efforts at various durations) and keep testing every few weeks and you’ll start to learn where your FTP is.
I find a turbo much easier for FTP tests. It just takes away the distractions and means every test is consistent.