Broken ribs really hurt. I broke 2 last year when i slammed into the side of an idiot driver. - I damaged the car a lot in the process!
i was back on the trainer in about 2 days and did lots of very easy zone 1 then zone 2 work. i also walked a lot. The limiter for me was as soon as i started to breathe deeply and my chest moved i would feel the pain. It was a good month before i rode properly agin and i was down on the power all summer. It sucked. But it could have been worse.
Good luck. And no laughing 