Think just 1 season long.
It only takes 90 days for the Georgia Jet cultivar. other
https://www.vermontbean.com/P/04720/Georgia+Jet+Sweet+Potato
Regular ones from Caribbean/South America takes
alot longer but they are
perennial and never die, and just
root so it doesn't matter like it does for us here with winter.
My recommendation would be to buy slips the 1st season and then grow sweet potatoes tubers
And then use those tubers start slips for the next season.
They are also tropical and love the sun. So plant them in for the hottest 90days.
Other than georgia jet other American cultivars take up to 120days.
While I have zero faith in you getting a tuber harvest from important non american cultivars for sweet potatoes slips that you start yourself. There might be a harvest if you can 100% guarantee that the starting tubers are American cultivars.
Iterations are fine, we don't have to be perfect
My 2nd Location:Florida HardinessZone:10 AHS:10 GDD:8500 Rainfall:2in/mth winter, 8in/mth summer, Soil:Sand pH8 Flat