It'll almost surely take less time, part of the reason 0.17 took so long was because the Part Design Workbench had compatibility-breaking changes with a whole n

It'll almost surely take less time, part of the reason 0.17 took so long was because the Part Design Workbench had compatibility-breaking changes with a whole new workflow. It's probably overly optimistic but some of us are pushing to have this development cycle last roughly until the end of the year before we begin the release process again. At the earliest, that'll probably mean another release this time next year.