Based on the information available:

Individual rounds typically last only a few seconds. One source states, "Usually, it takes about five seconds."

The duration of a full "Aviator Game Online" can vary greatly depending on the player's strategy, goals, and risk tolerance. There's no fixed "average" as players decide when to stop.
Some players might play for short, focused sessions (e.g., aiming for small, consistent wins).
Others might play for longer periods if they are using specific betting strategies or chasing higher multipliers, though this is generally not recommended due to the addictive nature of the game.
Essentially, while each round is very brief, the session length is entirely up to the player.

You're right to ask for more clarification, as "gameplay session" can be interpreted differently. Here's a breakdown of the duration aspects in the Aviator game:

1. Duration of a Single Round:

Extremely short: This is the most consistent and important detail. Each individual round of Aviator typically lasts only a few seconds, often around 5 seconds. Some sources mention a range of 8 to 30 seconds depending on the odds reached, but the core idea is that the plane takes off and can "fly away" very quickly.

The goal is to "cash out" your bet before the plane disappears from the screen, and the multiplier increases as the plane flies. If you don't cash out in time, you lose your bet for that round.

2. Duration of a "Gameplay Session":

This is entirely player-dependent and there's no fixed average. Since each round is so quick, players can choose to play for:

Very short bursts: Some might play just a few rounds, aiming for quick wins or trying out a specific strategy.

Longer periods: Others might engage in "sessions" that last minutes or even an hour or more, stringing together many short rounds. This depends on their bankroll, risk tolerance, and whether they are following a strategy (e.g., Martingale, minimal risk, or trying to catch high multipliers).
Sources about gameplay strategies often suggest setting time limits for a session to promote responsible gambling, rather than suggesting an "average" session length. This highlights that the duration is controlled by the player.

Some players might aim for a specific profit percentage within a set time (e.g., "I made 8% in profits in 1 hour").

Key takeaways:

Fast-paced rounds: This is a defining characteristic of Aviator.
Player-controlled session length: You decide when to start and stop playing.
Strategies often involve managing session duration and budget: Players are advised to set limits on how long they play and how much they bet to manage risk.
So, while a single "flight" is over in a blink, how long a player spends in front of the game playing multiple rounds is entirely up to them.