Between 6 and 8 - logged in an app so I can see trends quickly. It's so easy not to notice that I'm consistently a little high after a particular meal which should tell me I might need to consider tweaking the ratio for that meal. Morning and night tell me how the basal is doing (I'm split dosage) so I know if I need to think about basal testing.
The app records the carbs eaten, insulin injected, whether I've exercised etc and to be honest I'd be lost without it now. I have coming up to 3000 entries stored and the accumulated data really does help keep me more or less level.
It will calculate insulin dosage for me if I input my ratios (which it stores), carbs and current blood. It also asks if I've exercised recently so it can take that into account. Provided I keep the ratios spot on it's usually right. Currently I have four ratios for it to work on because it changes as the day goes along. It'll also keep track of injection sites if I want it to, but I'm good at changing site so I don't need it to.
I could more but tbh I'm more or less happy as things are.