A phrase used to express when you'd like for someone to do something, but
you don't want them to feel pressure to do it immediately or to feel burdened by it; rather, whenever they have the chance or if they can.
It is also used to express when
you're not intending to pressure someone or to soften a request you have for someone so that it doesn't feel hard, harsh, or demanding.
It can also be used
sarcastically, in an event when there really IS pressure to so something.