Night Fatigue

[typhoon]

I've tried looking this one up but cannot find my answer. Do we know how much night Fatigue is accumulated for moving in T mode at night on a road. Is it variable? and does unit quality come into play like with disruption also does it vary depending on how far is moved. On a side note guessing that firing and Digging in accumulates fatigue in the same way just want to know how big a hit we are talking to see if it's worth doing in some cases.