In a conversation where someone knows what you are talking about (it has been mentioned before what these tasks/works are) you can say "This is draining me" "This is so time-consuming" "This is both draining and time-consuming".

اگر میخوای به چندین کار اشاره کنی میتونی بگی affairs ولی work نباید اس داشته باشه. Taking up : وقت گرفتن

You can say. These tasks take a long time or extra time

“Works” is wrong Work is uncountable