I don't have a number/ week I aim for. I probably run low pretty regularly but feel them coming on, like a mild buzz rather than back in the days when I'd get sweaty and all frazzled. I get a bit frazzled. I have a CGM so it gives plenty of warning.
To me, every low is a different tactical challenge. I hardly ever take 15G of carbs to treat them as probably 90% of the lows I have are more "drifts" into the 60s than the sort of precipitous "dive bombers" going from 120---> 45 in like 1/2 hour because of some sort of calculation error. The drifts, I kind of nudge up, maybe 3-8G of carbs. If I'm at work and it's 45 min until lunch and I'm drifting lower than I want, I'll dip into some carrots early to nudge it up. I use a mix of Smarties (faster dextrose) and Starburst Jelly Beans (gooeyness helps texture of Smarties, plus they are yummy as hell...) and will have 5-6 for the vast majority of my lows. This seems to prevent the "rebounds" or "liver dumps" that are very widely reported in posts/ blogs/ FB/etc. for me.
Since I don't "count" or "keep score" of lows, I don't worry about "counting" this or that number as a low. Really, even when I decide to do nothing (e.g. 75, flat, 1/2 hour until lunchish time...), I'm still making a decision to keep my course steady with my hand on the tiller. We moved a couple of years ago and my doc initially expressed some concern about the "number of lows" but, as long as I feel buzzed, like I can perceive them, I prefer to stay close to that edge rather than running higher. My doc has been nothing but positive lately and I have a fairly high activity level that helps some of my other numbers (heart rate, cholesterol, BP, miles/ week, although that's taking a beating w/ the cold weather and holidays!) and supports this approach.