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The bounties are the only Starfinder adventures I know of that fit within 1-2 hours. There are 12 of them to date; #1-8 are for 1st-level characters, while #9-12 are for 4th-level characters. (These levels were chosen to match the levels where pregens are available.)
Starfinder Society scenarios are designed to be played in 4-5 hours, as are the Free RPG Day adventures and One-Shots. Nearly every other Starfinder adventure I'm aware of is a longer module or part of an Adventure Path.
That said, there are a number of SFS scenarios that fit the "quest pack" format, with 4 or 5 individual quests that are designed to take about an hour each to play. In most cases, these quests can be played in any order, except for the final one, which is usually meant to be run last, as it ties up the whole story. If these quest scenarios are being played for SFS credit, and there is insufficient time to complete all of the quests, the GM marks which were completed on the chronicle sheet. The player can complete the rest of the quests at another time to get full credit, as long as they haven't played any other adventures with that character in the meantime. Otherwise, they get partial credit based on how many quests they did complete.
I lack the time and access to my library to check which scenarios are "quest packs" at the moment, but perhaps someone else here can provide a list?