I used to call any day after a washing+styling day a 2nd day, but it wasn't really. When I started wearing my hair curly and my hair was longer I considered my 2nd days to be the best, but that was after misting my hair and add some more product and diffuse. My hair is low poreus and with tailbone hair it was getting weight down by the water on 1st days too much to consider it nice and curly. On 2nd days styling it curly was much easier.

Nowadays, I've been NC for 1.5 years and my hair is midback (BSL?), it's much easier to get a good 1st day and 2nd day is after pineapple and rootshake and hair is still looking good.
I must add that I'll settle for slightly frizzy yet voluminous, wavy-curly hair on 2nd (and 3rd) days. After trying to make my hair as curly as possible every day for a long time, I now enjoy the fact my hair curls and waves differently every day.
2b (mixed with 2c/3a) med/fine- low porosity- normal elasticity, BSL
2B/C-3A) fine - low porosity
Wash: Daily Fix,SMT, Kesham, Urtekram
RO: Motions CPR Li, Inecto Cocos co, AO GPB, KCTT
acv-rinse, sometimes honey-rinse
LI: coconut oil (winter), CJBC-LI
Styling: AVG, Etos Solid Power Gel, Taft gel, CJPP
Plopping~Pixiecurl diffuse~clipping