What to do depends a little on whether your 4 hours of imaging are all at one exposure or are bracketed in exposure. If bracketed in exposure, then Photoshop (say CS6) can help using HDR type image processing. If it isn't bracketed then it is possible to do something similar by "creating" the bracketed exposures in camera raw and then using HDR Photoshop CS6. Perhaps look for some youtube tutorials on HDR imaging, possibly.....
OR ....
It is also possible to do the sort of thing shown in the tutorial in a more "handraulic" way using layers in Photoshop and dodging in detail in selected areas (the over exposed areas) by adjusting transparency. The image layers can be created in camera raw with various degrees of under, normal and over exposure.
Best
JA