How long does it take to receive a refund for an accidental subscription charge?

I signed up to a free trial of LinkedIn and i forgot to cancel it. It charged me around 240 USD which is nearly around 7500LKR. As soon as i saw the message I cancelled it and I requested a refund. Yesterday K received the decision saying REFUNDED. I used my debit card, I want to know how long it will take to refund back to my bank account.

[Re-Titled by Moderator]

Original Title: Accidental subscription charges