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a few days for a tub
God! If it's taking you a few days to change a tub you're doing it wrong!
If the rim is prepped properly for the first tubular, replacing the tubular thereafter should be a breeze!
Whip the old one off, one layer of set glue on the tubular (can be glued in advance to speed things up), one layer of tacky glue on the rim, bang the tubular on, pump it up. Easy! 30 Minutes tops!
Really for me it is just the time it takes to replace a tyre. 5 mins for a clincher, a few days for a tub.
What hubs are you stripping? Maybe an issue with how you are fitting them?