Pleco size/ tank size?

Hi all! I have a common pleco of unknown gender, and was wondering whatbthe final tank size needed would be?

I bought it (I think) over a year ago, and TBH never had them love long enough to grow too big for its tank lol. It was on sale, and was in the beginning of my hobby. So basically an impulse purchase... I know better now, so dont go after me lol.

I might can get a 120gal at my dad's, but I'll have to save a ton of money lol. Hopefully when the time comes, I can get it off FB market place, and it will be in good shape. If I watch a few YT vids, im sure I can caulk it if it needs it lol.

TL,DR: whats the final tank size for a common pleco?