whenever you want; any time you like
A set phrase meaning 'at your convenience' or 'whenever you feel like it'. Used to give permission or indicate flexible timing.
Please come whenever you like.
You can read this book any time you want.
Standard kanji-kana spelling.
Variant with に in kana; equally common.
From 好き (like) + な (attributive) + 時 (time) + に (particle), literally 'at a liked time'.