Time might not flow the same in FTL as it does here…100 years there might be two weeks here. Also, did the giants have magic? I bet Rumple will be able to help the process when he gets back. I am assuming his magic loss is just because he was outside of storybrooke.
People keep coming back to the idea of time running differently in FTL and SB. Which I think is how they might explain it, but time seemed to move exactly the same when Snow and Emma were trapped in FTL back at the start of this season.
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"He was a lot of things to me" "The only conclusion was love"