It depends :)
On average, about 4-5 weeks for major content updates (once per month), although 0.22 and 0.23 were a bit faster at 3 weeks each.
0.24 is planned to launch early April (for patrons), but I might release a smaller 0.23.5 mid-March to shorten the wait, then 0.23 would become free a bit earlier, too.