How are Bullet, Blitz and other time controls decided?

Lichess time controls are based on estimated game duration = (clock initial time) + 40 × (clock increment)
For instance, the estimated duration of a 5+3 game is 5 × 60 + 40 × 3 = 420 seconds.

• ≤ 30s = UltraBullet
• ≤ 180s = Bullet
• ≤ 480s = Blitz
• ≤ 1500s = Rapid
• ≥ 1500s = Classical