Usually how long it takes till the next update?
4-4.5 months from Public Release date.
0.1 (released for highest Patreon tier Sep. 2021, public release 3rd week Sept. 2021) - (only had 1 scene)
0.2 (released for highest Patreon tier Dec. 2021, public release last week Dec. 2021) - Took about 3 months (only had 1 scene)
0.3 (released for highest Patreon tier April 2022, public release 1st week May 2022) - 4 months (had 3 scenes)
0.4 (released for highest Patreon tier Aug. 2022, public release 1st week Sept. 2022) - 4 months (had 3 scenes)
0.5 (released for highest Patreon tier Jan. 2023, public release 3rd week Feb. 2023) - 4.5 months (had 4 scenes)
Next release likely to be around June if it follows the sched above.
UPDATE: Based on the posted progress report as of March 20 at 11:05 AM UTC and of Caribdis' own statement in the latest Sneak Preview post for 0.6, I think I'm revising my earlier statement and say that the next update could drop around late June or slip to July at the latest.