As much as one likes; to the extent or amount someone wants (e.g., 'eat as much as you like').
パーティーの料理は好きなだけ取ってください。
Please take as much food as you like at the party.
好きなだけ休んでから仕事に戻ってください。
Rest as long as you like before returning to work.
部屋で好きなだけ音楽を聴いていいよ。
You can listen to music in the room as much as you like.