Exactly the same happened to me, 1500+ hours for everything. I managed to fix it once by loading a save in SP, saving it, and then return to MP where it is then fixed. But this only worked for a short while and after the delivery all times were 1500+ again.
Personally I don't care about it, as long as it doesn't affect the deliveries that I should get when I get a new skill point (I don't know if that is the case).
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