How much time do you normally spend on airdrop?
It depends how much you value your time.
For example I am currently participating in the Prom Sprint Campaign on Zealy.
It has a prize pool of $10,000 worth of $PROM.
I expect to receive $250
I have spent 4 hours to do the tasks required for winning this money.
Maybe $250 is not a life-changing amount. But it surely feels nice for a couple hours of unskilled work.
The Sprint Campaign mostly revolves around posing and reposting twitter posts and occasionally downloading an app from google play/app store a couple of times.
There are about 100 of such tasks, but they are not really hard.
By the way, the campaign will go on for 3 more days. And anyone interested still has time to join and compete.
I don't promise you can easily take my place and earn $250. But everyone in the top 200 will earn at least $30 or more.
Best thing, it doesn't matter how late you join.
Because the number of tasks is fixed and will not change regardless of when you start doing them - in the beginning of the campaign or in the end of it.
So generally, getting even a hundred dollars for a couple of hours of retweeting threads on twitter is a great opportunity in my books.
But its you who gets to decide if your time is worth it.