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a recommendation for the team make up, and an approximate time range in which you can expect to finish it.
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Those are kind of quantify. You might end up convincing new players that they "have" to run the task force in the team formation a Dev slapped on ("you should have every AT! Every person is a unique snowflake!") when that's certainly not going to be a realistic team composition except in some weird world of ideal (dev test

) conditions.
A time frame is hard to pin down since it depends on the team composition and character. Positron: 2 hours if you know what you're doing and don't have players stopping for an AFK break every mission, 9 hours if you're a PUG and do have random AFKs, drop-out members, and general disorganization.
in big red letters they could flash: THIS WILL TAKE LONGER THAN AN HOUR, PLEASE CONSIDER THIS IF YOU NEED TO GO TO WORK/SCHOOL/BED WITHIN THE NEXT HALF HOUR.
What if they did something weird like everything unlocks a costume piece or some a permanent flavor power(emote)? For doing Positron maybe he gives you a toy helmet replica of his you can hold.
edit for a brainfart in team size..
ooh, they should reduce the start size requirement of the highest level TFs though except for the ones that absolutely REQUIRE 8 players to accomplish some in-mission task, like clicking 8 glowies in unison. I remember how hard it could be to just get enough warm bodies to fill the slots.