Session length significantly influences expected loss in gambling because it correlates with the amount wagered over time. Generally, the longer a player stays engaged, the higher the total bets placed, which can lead to increased losses due to the house edge inherent in games. As players spend more time gambling, they may also become less aware of their spending and more prone to chasing losses. This extended exposure can amplify the impact of variance, potentially leading to greater deviations from expected outcomes.