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In all fairness this look like maximum 3-4 hours work? I dont think it will take long as long as you got everything ready to work with and you have some experience with doing these things before.
it took me 5hrs because I had to stop and take pictures with each step. with a diy project, no matter how well the instructions are pictures are even better! well at least it is for me. then there was the "which wires to tap" I found a posting by RomanTPA that suggested which wires for the subs but it wasn't confirmed and the remote wire color was incorrect for my 04. eventually had to bust out the volt meter to figure things out.
if I had to do it all over again I could probably knock it out in an hour.
oh and another thing... if you have a remote bass line, it would be best to run it while the back seat is out.