Oh cool I've been doing that too! For me I tap the first 41 and then I let go lol The thing is that 50 life games gives you 200 Hinapoints, but a 5 life game gives you 38 Hina Points.
If you do the math, a 50 life game gives 200HP, which means you multiply the life cost by 4 to get the amount of HP you're gonna get, but if you do that with 5, you're only technically suppose to get 20 Hina Points in comparison, but you don't, you get 38, which is +18 points. The only issue with this is you DO have to tough it out playing LOTS of easy games (eg, a 50 cost game is 2 minutes gets you 200, but 10 games of a 5 cost game is going to be 20 minutes of gameplay but gets you 380...so yeah)
Theoretically, if you play straight on, you can get 10,000 HP (which, after 25k, you can get a Maimi/Yuka) by playing for around 9 hours...(10,000 HP / 38 HP per game = 264 games needed, each game taking about 2 minutes, 264 x 2 minutes = 528 minutes, and 60 minutes in an hour so 528 / 60 min per hr = 8.8 hours.
I've gotten my 3rd Maimi earlier today and now I'm about 6k away from getting my 3rd Yuka, and tbh, I'll probably stop there cause I've played tooooo much of this game over the weekend (and tbh I think it's lucky enough that I have 3 copies of my first 3 SR+ cards: I have 3 SR Cappys, and having 3 of Maimi and Yuka would be a nice balance lol I'll LB them when I get more SR+s or if I get to max lv one of the copies, whichever one comes first, since tbh I dont wanna make teams with clones, it just doesn't give me enough space to put other nice looking cards
)
Also, 3 is my favorite number, so yeah lol
Had I known this before I probably would've played a good amount last weekend too and probably get a chance at copies 4 to 6 but, I guess now, we'll know for next time. And, according to CrazyDAC, these cards are currently the weakest in their respective rarities, so it's ok.