It increases by age...
Industrial is 150wins
Let's say you are a casual player with around 5 attacks / day , you would need 30 days to complete, not 7...
From the other side: it's 21 attacks per day... with a training time of 40minutes for the a full army would still need nearly 16hours per day
constant playing, since logging off would mean get locked out by permanent scouting...
Not considered yet, the no opponents problem...
But anyway, someone already has said what's really important: nobody forces anyone to do anything.
It's free, so just wait until the next event, and hope they are doing realistic challenges in the future.