Here's a suggestion: The contact should SAY, in the mission description, BEFORE you accept the mission, whether the encounter is too tough to solo (Archvillian at the end, for example). Maybe in the form of just recommending you get help, that kind of thing.
And oh, another suggestion, stop any and all timed follow-on missions (i don't know it's coming, and after the current mission i want to log, but oh, hey look at that, 90 minutes to finish the next mission, and oh, the counter counts down whether i'm logged in or not). Either stop them, or only start the timer when i've entered the mission, or stop the timer when i log off.
Thanks.