Has anyone experience on how much rain/mist the FPV can tolerate without dying?

A few weeks ago I was doing some long range runs and got caught in the rain about a mile or so away. I scurried back, but the drone went through what I would call a “light rain” or perhaps a “heavy mist.” Got it back and landed quick as the heavy mist got harder. It seemed to be fine. It wasn’t soaked, but damp in areas. I wiped off what I could and let it air dry very thoroughly and it has been fine ever since.  I wouldn’t push it more than that. I was in the heavy mist for no more than about 2 minutes.

Hi there. Thank you for reaching out. We do not recommend flying the said unit above/under the operating temperature (-10° to 40° C (14° to 104° F) especially when it got contact with water or rain as the unit might experience some errors or damage. Thank you for your understanding and support!

... my MA2 was no longer repairable after a flight with rain, according to DJI.  
But I got it replaced, thanks to care refresh ...
      

Good question