I do not see much benefit for a LTS version.
KiCad is not like an operating system (even that installs in 10 minutes these days), but installing and configuring all prorams you want to use for that operating system can take a lot of time.
KiCad is “just a program”. As a hobbyist, I’m quite fine with installing newer versions as soon as they are officially released, I’m even thinking about putting some toes into 5.99.
As a company I may be a bit more cautious, maybe wait a month or two before an upgrade. But even so. If there is a serious bug. It’s pretty easy to uninstall and revert to an older version if needed. As long as the mayor version number is the same, there will be no file format changes, and that should be enough.
I am curious for reasons for companies to pay for support for KiCad V4, as it costs more then support for KiCad V5, has less features, and upgrade is free and I’m not aware of mayor bugs in KiCad V5.
That said, back to the original question.
In the completely unofficial guesstimate below, there are 8 months from “Feature Freeze” to “Release” for KiCad V5.
And the guess was quite accurate, with release on:
Overall I’m quite happy with the way things are progressing.