Yeah mine last about 7 days so it's close!Thanks man~!
I have CO2 also but my room is larger.
I was just curious how much you used.
You said 4 bottles per flower cycle so I had to know what size bottle.
My 20lb. bottle last about 10 days- 2 weeks for me.
I use an InkBird controller/meter and cheap regulator.
I was into fish so had a bottle and a $400 digital regulator that boast to be the most controllable regulator made.
Could give enough really. Cheap $49 reg. works great~!