How long before it felt normal?

I just started invisalign yesterday. I admit it felt okay at some points and rough at others. Pain isn't really an issue but the bottom one keeps irritating my tongue to the point I feel like I'm taking them out often. So maybe in the day rotation I had it in about 20 hours. How long did it take before it kinda felt normal? Cause the way I feel about this on the bottom on my tongue I'm really feeling like the bottom is gonna be coming out way more than the top...