at (one's) convenience

When one has the time to do something. No rush, you can fill out that paperwork at your convenience.

Name	Pronounced	Usage
Carlinhos	-	Portuguese
MÜNİRe	-	Turkish
Florette	-	French (Rare)
Randi (1)	RAN-dee	English
Manno	-	Ancient Germanic
Winfrith	-	Anglo-Saxon (Latinized)