@nolimits,
Have you ever seen a guy do a street stop? It is not an especially normal behavior to engage in. I don't know any guy who isn't in "gotta get my reps in to level up" mode who does tons of street stops.
You don't need to restrict yourself to only incredibly beautiful girls though. Once you know how to street stop and you're out of the learning phase, you will instead use street stops strategically... e.g., you're walking down a quiet street in the afternoon and you see a cute girl headed your way. Street stop. You're at an outdoor mall and you've just exited a restaurant with a buddy of yours, in a good, social state, and you see an attractive girl about to cross your path. Street stop.
Like that. Not limited. Opportunistic.
4's the minimum, yeah.
I think it's a good number because it doesn't feel like a lot.
Once you start doing it, you may find you're warmed up and want to keep going.
A lot of it depends how good your targeting is, how advanced your game is, what your hit rate is, etc.
But there's also the question of "how well does it fit into your lifestyle?"
If you go out and push yourself to approach and you're "just approaching", results don't always seem to be as good as when it's opportunistic. But it's hard to get 10 approaches a day in opportunistically unless you're really on fire or you're outside
all day long. 10 approaches usually means "dedicated day game session."
4 you can do opportunistically: chat up the girl waiting for the train... chat up the girl near you at the coffee shop... street stop a girl walking out of a store... chat up another girl in the store. That's easy to do if you're moving around a little but not a lot. (but it also could be you are outside a lot more during the day or are a lot more mobile in your outings!)
That's not to say 10/day is a bad plan though. One of the guys I learned from lived far from the big city and had a 9-to-5 that kept him working regular hours. So he'd drive into the city on Saturday, day game for 12 hours straight, then drive home, text all his girls, set up dates on Sunday, then drive back to the city on Sunday to meet his dates at the mall, run them through his date process, then bring them to this van he had strategically parked in a lonely part of the parking garage and shag them there. Basically a pitch-perfect way of getting the most out of a dedicated day game session, I'd say.
Once you're skilled at day game you can also do the thing where you just go out early and start approaching and just approach all day until you find a girl who'll go home with you. That can be fun, but kind of exhausting unless you get a girl who hooks hard early on, and it's not usually something you want to do every day.
More to your question... if I was hard-up for a girlfriend and I didn't want to do any screwing around, then I might just do 10-15 DG approaches per day until I found her, sure. Usually though you can go out and do 4-5 DG approaches, get a lead with one or two cute girls, see if you can lay those girls, do more approaches, lay a few more cute girls, bag a stunner, but whoops, turns out she's not girlfriend material, keep going, another cutie or two, then suddenly there's your girlfriend. So long as you're not desperate to find her ASAP, and are fine to shag a few cute girls along the way to her, you don't need to go crazy doing a ton of approaches... buuut if 10 is no different for you than 4, then by all means, could work great!
Chase