After gameplay I retimed this run using https://somewes.com/frame-count/ with a console FPS of 60.098813897441 which is the NES native framerate according to http://tasvideos.org/PlatformFramerates.html and raw video framerate of 60 FPS for a total of 29289 frames or a Console Time of 8:08.150. First Frame set on the frame before the black frame after selecting Game B and End Frame set on the frame my score is over 250,000.

I use Nintendo Entertainment System Model No. NES-001 with "Super Mario Bros. / Duck Hunt" cartridge Model NES-MH-CAN, Nintendo Zapper Model No. NES-005, RCA CRT and GV-USB2 Capture Card. Hardware check at the end of the run.