Peglin is pretty good, each stage doesn't take very long.
Android
DROID DOES
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Peglin is very good
Deck’em and Strategery
My go to recently has been some solitair.
I normally get a game or two of Mahjong Solitaire done when I have a brief respite.
Rabbit Escape, Burger Party
I play nonograms katana when I'm on airplanes. Could fit your situation as well. the smaller ones take less than 5 minutes to complete
https://play.google.com/store/apps/details?id=com.ucdevs.jcross
Radial
Tux cart Minetest
8 ball pool. The popups/ads suck, but you can play time attack mode on single player offline. Also a good time killer while online.
Gubbins is a fun, new kind of word game.
Nonogram is a fun puzzle game.
Brotato
Been playing Gauguin. It's like sudoku but with math to solve.
Either (or both) of the two games by this developer: https://play.google.com/store/apps/dev?id=8857752720402747582