If you want the Manda glider, you'll need to do a total of this:

45 Matches of Fortnite and make sure you get in the top 6.

You need to survive 216 Storm circles.

Catch 180 Fish

and Kill 162 players.

Every match of Fortnite can sometimes last for 30 minutes, so 30 x 45 = 1350 minutes, which means it will take a total of 23 hours to complete the survive 45 matches.

EDIT: Did the math for Storm circles, there are 9 storm circles per match, you need to survive 216, it would take 33 hours for you to complete the storm circles, so plus that with the already 23 hours we have, it would take 56 Hours for you to complete

TOTAL: 56 Hours (Ammount of time for matches + Storm circles)

They're not worth doing for the sake of your time and mental health.