Hi Eddie
I bought an 8GB card just in case I needed it, but 40 hrs is rather ridiculous, as I upload my video after each gig to a 2T external drive for storage.
My wife handles the Q3 and records chosen segments only, so I didn't need to buy a larger card. OTOH, the cards are cheap, so go for it.
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact