Hi guys,
Just thought i'd make a note here for future reference as I had the same question when I was looking into the Canon cashback.
The canon cashback website states payment will be made within 30 days of receiving the claim, in my case it has taken 25 days so while the website states within 30 days it seems payment is made later as oppose to earlier so beware of having funds tied up for nearly a month.

Keep in mind it's during xmas/new year time period and probably wasn't even looked at further until the second week of this month. If you value prompt cashback iirc Brother is something like 10 days guaranteed(or they pay you some $$)