これは時間の浪費のことです。waste of timeです。
"Ever since I got on Facebook I haven't been able to stay away. I'm spending hours on it each day -- it's a total time suck, but I can't stop! Grocery shopping and laundry will have to wait.
time suck のほうが形容詞として使いやすく非常に便利です。time suck videoのほうがtime wasting videoよりも言い易いです。
