I can't speak for your Canon as I've never used one - but on my Pentax the amount of time it takes to process and store the image on the card is just about equal to the exposure time - if I take a 60 second exposure then it won't be done processing and writing for almost 60 seconds. I haven't quite figured it all out yet, but sometimes I can take another exposure and sometimes I can't until it is done. I would think it would buffer some - I haven't quite figured out the limits of the buffer on my camera yet. Maybe your "hang" is similar to this (as suggested by seltzer)...
Mike
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Pentax K100D, Sigma 70-300mm F4-5.6 Macro Super II, SMC Pentax-DA F3.5-5.6 18-55mm AL, SMC Pentax-M 1:2 50mm, Vivitar 1:2.8 MC Wide Angle 28mm, Pentax 540FGZ, Vivitar 285HV, Cactus wireless trigger and receivers
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