I recently passed the C1 exam and am wondering what other people did after that level. I feel equally interested in learning to speak Swiss German, continuing on with my high German, and bringing my very VERY rusty French back to useable order.

It would help knowing how long it might take to get from C1 to C2, but the information out there is a bit hard to find, especially since "C1" as a search term is too short for the forum search function.

To me, the main difference between C1 and C2 is the amount of vocabulary. Your grammar should be all right by now, some more details to work on probably, but vocab is really a never ending story.
Work maybe on making your German more idiomatic, that takes a while. Reading specialized magazines, real literature and arguing about politics could be areas to look into too.

I'm trying to consolidate what I learnt at c1 so have been slowly working through the Dreyer Schmitt grammar book.

I've also taken out a subscription to Tages Anzeiger (it is delivered early in the morning direct to our post box) and started a German book club with some of the mums from the local school that my kids go to. I also try listening to Kontext on DRS2 (via the internet).

I don't know how long it will take for me to get to c2 level - I've considered doing a course at ZHAW but it's quite expensive and I still feel like I need to improve my grammar and writing skills etc before I take such a course.

Finally, I've also started with the Swiss German learning group on a Wednesday evening in Zurich.

Thank you for the input Faltrad and Tuesday.

I currently try and read articles in Schweizer Familie simply because the articles are interesting to me. I haven't tried reading a book yet. Well, I did and it was too hard, but that was a few months ago, so maybe I'd have more success now.

I take private lessons. It's much more time and cost efficient for me. 100% of the time invested during the lesson is about me and my German. As much as I'd love to meet new people in a group setting, private is too practical for me to give up and I have a great teacher.

I am interested in this topic as I passed C1 in July and finished up with my daily classes recently, now I am worried that my German will simply fade away unless I make a firm plan to maintain and improve it. I have taken out a subscription to the newspaper Die Zeit, some articles are too difficult but most are okay. I find that german translations of english novels are easier to read than german originals. My real problem is speaking though, outside the classroom I find it hard to get the words out in the correct order. It's a confidence thing.

Interested to know how much private one to one lessons cost jetset. Thinking of getting a teacher for my wife. Would be good to know the benchmark.

Congrats. I used mine a bit at first and then let it rust over a number of years (replacing my OK authentic-ish accent with a French accent - I moved to France), before frantically trying to get it back when interviewing for the job that brought me here. Guess it was not too rusty after all

Under the watchful supervision of prof. taratonga, a small group of us have embarked on a quest to understand and even speak Swiss German - e.g. Wednesday in Zurich from 7 p.m.

WRT French, not sure how rusty you are, but there is a group called Les Jeudis Francophones I signed up on arrival here, but have yet to go to an event. Otherwise to keep a language, practice. To improve, read.

English, French, German, Swiss German. Nice. So when are you starting Italian? Don't think I'll ever get onto Romansche...

I buy my lessons in packages of twelve 60-minute slots for 92 CHF an hour. Once you become a repeat client, you get 8% off. You can decide if you want to do 45-minute or whatever suits you in length, but once your 720 minutes are up, then you buy a new package. Once you're in exam preparation mode, it jumps to 105 CHF an hour. But that usually is only 4-5 weeks before the exam that you're in that mode.

I'd say I worked with my teacher once a week most of the time, but for a few months it was twice a week. Right before my C1 exam, I was SUPER nervous and met with her 3-4 times a week. But I still don't think there's any group course I could have taken to get me from B1 to C1 in 12 months when I add up how much I paid.

Good luck!

Ha, that made me laugh! Thanks! The information you provided is really helpful. There's absolutely no way that I could interview in French right now, but there was a time when I in fact lived and functioned in French speaking families during my study abroads. The language is somewhere there still...I hope...