how and when you want to, even though this might annoy other people :
He always does the work, but in his own sweet time.
IN YOUR OWN SWEET TIME / WAY
Meaning of IN YOUR OWN SWEET TIME / WAY in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005