So what is involved in the ideal session? First, I need a space in which everyone is physically comfortable and allows for easy communication. A nice table with plenty of space is great. If the game is online, then the software used should allow for easy talking or chatting. If the game is taking place in meat space, then some snacks and beverages are good additions. I prefer game friendly snacks, such as pretzels and cut up vegetables. Sauces, greasy foods, and other messy items add stress to the gaming environment.
There should be no time pressure so that the story can unfold, but the game should not take too long. The players should be leveled up and prepared. The GM should have notes ready. Dice, paper, and pencils are available to all. Miniatures or crude markers are nearby to show positions and distances. Most importantly, every player is ready to have fun. That is what would be involved in the ideal session.