Base position logging

I would grab some same-day data from a close-by CORS station, use that as a base, and then have your 8 hour obs as the Rover.
Set it to static, and play around with the AR modes.
Also remember to use the Combine option, not only the forward/backwards. In my mind that there’s a huge difference just from that.
I have asked something similar a few weeks ago, maybe it could be useful for you as well: Using NTRIP station 178 km away? - #7 by TB_RTK