Very new at MBB, stressing over learning curve

Very recently started at an entry level consultant position at MBB (only a couple of weeks). Prior to this I worked at a small financial firm at a relatively stress-free environment - especially in comparison with management consulting. So far it feels very overwhelming - I joined a project from the middle and everything is already moving very fast. Understandably they are trying to meet deadlines and trying to ensure I get some sort of exposure to the work - but I'm not being trusted with the real stuff, only a very minor part of some of the research. I am amazed at how while I try to dig my way through an enormous number research documents to bring together with 2 slides-worth of data (of which only one or two lines end up making it to the final PPT), the team creates a document of almost client-ready 20-30 page material. I try to get involved as much as i can with the team discussions but it seems like they are always 5 slides ahead of what i want to say. I know everything is tough in the beginnings (most especially MBB :) ), and i have been here only two weeks, but this feeling/fear of "HOW AM I SUPPOSED TO SURVIVE AMONG THESE SUPERSTARS" is eating me up :)

For all the fellow / ex - consultants out there - how long did it take for you guys to feel like you are learning the ropes? I know it's never comfortable since you jump from project to project and everything gets renewed every few months... but how long till you felt like you are getting the hang of it and you actually know what you are doing (in terms of how to do analysis, how to produce at least acceptable-quality ppt, how to know what to look for and where to look for it, how master the efficiency instead of boggling down on the details, etc. - you get the picture) ? Practice says in most cases it takes at least around 3 months to get used to any job, but with these kinds of high stakes at MBB, are you given enough chances within the first few months to grow out of your shell?

Looking for comfort :) Appreciate any insights on this.