how fast adwords coupon is added?

Hi guys. How fast does adwords add coupon to the account balance nowadays? I have read that it takes up to 5 days but 1 guy told me that its instant. I know that trying myself is great but may be someone who uses coupons can just simply say? I dont need general information I just need someone who does it and knows to tell me. So how long really does it take after spending the required amount to get the balance of coupon to show up after redeeming? Thanks

The last time i used it this year, it was a Spend $25 and get $75 Coupon, added same day.

Is there any other coupon available apart from that ?