If you wire them in series as you suggest, your voltage will vary a lot during discharge.
If you look at the following graph you'll notice that during ~most~ of the useful life of the batteries with a 990mA load their voltage will be closer to 1V. This means that to have a meaningful battery life you would need at least, say, 11~12 batteries in series. That said, this graph also indicates that their avg charge will get you from 50min to 80min life with avg AA batteries with your load.
Also, getting back to the fact that you need more than 8 batteries in series to extend the useful life of the device a bit, you have to find out if it can tolerate (11~12)*(1.5~1.6)V in their input. Most LED drivers probably will but I'm not sure about the fan.
IF they do tolerate, then you can do as others have suggested and add this battery set in parallel to extend battery life. This leads to the next point which is, to get a couple of hours of light you would need more than 20 AA batteries. Have you ever considered using RC LiPo batteries or SLA batteries?
They seem way more suitable for your load.