Is it safe to stay under 20% SoC for 2 days?

Actually, starting at low SOC for LFP is actually good for the battery. Fast forward to 8:20 in this video from a Engineering Explained https://youtu.be/w1zKfIQUQ-s

I have seen that video. The study he refers to is about cycling at low SoC improves battery life. But it didn't mention anything about staying at low SoC is bad or not. My understanding is staying at low SoC for a prolong period is bad for batteries. But if you don't let it stay at low SoC and quickly charge it as soon as you reach your destination, it won't be harmful.

No problem at all.

I'm sure 2 days will be fine. The critical thing is not to hit 0%. 2 days at 10 to 20% is less harmful than 2 days at 100%

But if it's operating all the time at 0-25%, means the entire life of the battery is in a low SOC. From this you can infer that keeping it in a low SOC is good for LFP

Low SOC is actually beneficial for the longevity. In that region your battery current is still far away from a "harmful state".

You guys have too many worries for this stuff

No, my friend did this and just 3 weeks later his wife filed for divorce.

No that low is bad for the battery. Even in the video he explained that keeping it around 50-70% for low mileage drivers would be best on the battery. There is a more official one which says 45-60% is technically best but there are problems being too low as well. That's why you don't usually store an EV at 20% but instead at 50%.