5+ hours does sound like a bit much.
Note, incase you have not, that installing SP1 needs to be done in a way very different from other patchs.
Follow it's instructions exactly.
As I recall you must un-install TRS2006 first, after saving your stuff, both downloaded and created by you.
Then install TRS2006 but do NOT run the program.
Then install SP1.
This is not a full list of instructions. I mention the above to give you the general idea of it's complexity. READ the INSTRUCTIOS and FOLLOW them.