To one's heart's content; fully or as much as one wants (usually used as 存分に).
旅行で存分にリフレッシュできた。
I was able to refresh myself to my heart's content on the trip.
どうぞ存分に意見を述べてください。
Please feel free to express your opinions fully.
週末は趣味を存分に楽しんだ。
I fully enjoyed my hobbies over the weekend.