I look at other books from the author if he has already abandoned storys its a no go.
Then if there is no update on a novel for 1week to 1month without authors notice i drop it, because it shows the author doesn't care enough. I mean its just 1 sentence "hey i can't update for the next days/weeks/month's " and then you as a reader know whats happening and you can wait. I have no problems waiting for months if i know he will be back but without that notice i will just add them to my drop list and than this story is dead even if it restarts 2 months later
In addition every translated novel look in novelupdate how many chapters they have
And when they have over 1000 chapters and don't at least update daily or every two days i drop them because with only 1 or 2 chapters a week it would be 10-20 years until completion and many novels have much more than 1k chapters.