If I visit 3 days in a row does it count twice '2 days in a row'?

One point for each consecutive day. No multipliers. Sign on for several days in a row and see for yourself.

If you visit Monday and Tuesday, you get one lurve point for visiting two days in a row.
If you visit Wednesday as well, you get another lurve point. Another for Thursday. If you don’t visit Friday, but you visit Saturday and Sunday, you will get a lurve point on Sunday.

I’ve gotten multiple +1’s in succession before. I think that’s been fixed though.

Yeah, it’ll show up that way if you don’t get any GAs or GQs on a particular day.

No, they don’t stack. You get one point each day max through that mechanism.

I never sign off, so the “two days in a row” shows up every night right after midnight. Once, I got a “two days” point after midnight, as usual, than another one showed up at 9:30 pm that same 24 hours period, followed by the usual point after midnight.