2 Months.
I found AIB's chargeback to be very good I've mentioned this a few times.
When I "donated" some cash to EZBoard to keep AAM Ad Free, and EZBoard immediately started showing Ads I contacted AIB by phone, told them I wanted to get the cash back, they asked me to fax them the details.
I did and had the cash back in less than a week.
Note, this I wasn't disputing that I had authorised the payment, which could take up to 2 months to prove/disprove.
But I'd have thought a dispute about whether I received the service would have taken even longer, so I was impressed with how quickly they turned it around.
I'm sure by taking back my donation Brendan ended up having to Foot the Bill. So I probably wasn't hurting EZBoard, but that's a different story.
-Rd