No finish line
Normal stages end around the 30-minute mark. Endless mode removes that end and keeps spawning tougher waves.
The pressure only rises. What cleared minute ten will not clear minute forty without help.
What survives the climb
Endless rewards scaling above all. Evolved weapons and deep passives carry you past the point where flat builds stall.
You also need room to move. A screen you cannot read is a screen that kills you, no matter your damage.
Treat it as a test
Endless is the cleanest test of a build’s ceiling. If a loadout dies at minute twenty, the build had a cap you missed.
The best early game build is a fine base, but push its passives deeper for Endless.