I suspect most people here are used to dealing with the majority of projects I've dealt with in my career - 2 weeks to 2 years in scale....
but not many dealt with a sub 1 hour build/test/release cycle :-)
Build (compile etc) took about 13 mins, 40 mins for test, then release
I never managed 24 releases in a day that I recall - 23, yes :-) Failures are expected in test, so 48 mins per test cycle (there were additional components such as digital signing needed for a full build that weren't needed for test to start) meant 30 were possible.
My recent teams dealt with Antivirus definitions as well as AV engine functionality - we dealt with Agile by definition, SCRUM was used as applicable (mainly the daily meeting component :-)) waterfall was how we described AV Engine features that took over 30 days to complete!
Oh - and AV researchers wrote engine features as well as vice versa, and the test systems came into the same group, so perhaps can be called DevOps too ;-)
History: Dr Solomon's, McAfee, Microsoft (Defender)