What i did in my last road trip (19 months) was:

• Configure the camera to record in 1 minute segments
• I wrote a script to use ffmpeg concatenate all the videos for a particular day while accelerating them e.g. 8x

It’s still a large amount of data but I can remember my trip day by day throughout 49,000 Km. (Well, less than that because I wrote the script half way)