2 hours zone 2 is ok to replace a 90 min SS ride - in fact I think that is an option in Chad’s ride notes. Boarstone with a TSS of 97 could replace some of the 90 mins SS rides. But in reality if your going to do zone 2 it should be longer. Given the choice I would rather do SS something like Galena, Monitor+5 or Carillon+2 than any of the 2 hour zone 2 rides. BUT I would rather do 3-4 hours zone 2 than either of the above. If you have time for 3-4 hours do the zone 2 if you don’t do the SS. 
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