Game length and pacing
Game length is a promise you make on the box, and pacing is whether the minutes inside feel earned. The most common complaint about amateur designs is not that they are bad but that they are twenty to fifty percent too long: the game makes its point, then keeps going. A reliable test is to ask playtesters, at the moment the game ends, whether they wanted more or less. "One more round would have been great" is roughly where you want to land, since designers hear "it overstayed" far more often than "it was too short."
Pacing is the shape of tension over time. Strong games escalate: turns get more powerful, stakes rise, and the endgame arrives while options are still expanding. Flat pacing, where turn thirty feels like turn three, reads as boring even when the mechanics are sound. Common escalation tools include growing engines, shrinking shared resources that force conflict, event decks that get harsher, and scoring that weights later rounds more heavily.
Downtime is the silent killer of perceived length. A ninety-minute game where you act every two minutes feels shorter than a sixty-minute game with ten-minute waits between turns. Reduce downtime by keeping individual turns short, letting players plan during others' turns (avoid board states that change unpredictably right before your turn if you want planning ahead to work), and using simultaneous phases where possible. Analysis paralysis is a related disease: if a turn presents too many open options, some players will stall, so constrain choices with hands, action limits, or timers.
Match length to weight and audience. Party games live in the fifteen-to-thirty-minute range, family games around thirty to sixty, and heavier strategy games from ninety minutes upward, and players judge value accordingly: a light game that runs two hours feels bloated while a heavy game that ends in forty minutes feels thin. When trimming, cut whole rounds or phases rather than shaving seconds, and check your end trigger, because the fastest fix for a long game is usually ending it sooner.
Video tutorials
How to design games that stand the test of time with Brad Talton
How NOT to design a MODERN board game