I managed to find a dual nav aero install on another airframe, but no est. hours on the doc. Have you contacted ASG, they hold the stc. I would guess at 80-120 mhrs based on experience and component location. T-Bag displays mounts need some possible considerable sheetmental work to install. 2 connectivity units (just a cutout for s/m install) into that have usb ports for updates.
The connecticity units are wired back to the EFB computers (a rack needs installed). I don't know if the STC found space in the cockpit and what is the acess like to run wires.
Each side has these components stand alone (no sync). There are intigration units out there that sync the 2 units plus offer a few more functions I believe. ST03335AT is your stc number.