If u r talking about The chunin metal. here r the benefits!

Ideally you use it when it overlaps 2x xp day (Monday), since thats the day you use pots.

How many days does it last ?

Check in the activate.

ideal time is late on saturday:
assuming it's 72 hours, this will give you:
both bonus weekend pack (sat and sun)
sun, mon, tuesday fox (note, it need to start on saturday after fox hour, so it last to tuesday after fox hour) for the 10% boost
sun, mon, tuesday sage/masuri (with a bit of extra ninja stat)

sat, sun, mon, tuesday survival. Note, if you are greedy, you can reset survival on friday and NOT do it, this will allow extra coins. (note holding friday survival will be penalized by unable to sweep, however, as you missed a day)

and monday pot for instance sweep bonus day.

nice idea. its in my bag. can i use that medal like 1 month later? or it'll disappeare after some time?

Nice ! Great minds think ahead :D

How about i sweep friday only until the 3rd point ? can i still sweep until the 9th on saturday? This post was last edited by AfterEffects at 2016-12-9 17:34 This post was last edited by AfterEffects at 2016-12-9 17:34

Not sure. The reason you lose sweep is because sweep requires full clear the previous day, and if you hold it, you obivously didn't full clear. So I suspect you wont be able to

From what i heard, the jonin medal trial expired by day and not by the hours :(

in that case, early on sunday then....
personally I value the extra fox at tuesday more than the "weekend reward" of saturday. Also 1 less set of survival....

Well that true. Thank you for the insights ! :D :victory:

My Chunin Medal is about to expire :'(