My HR was roughly between 65-70 and that was for around 15 minutes.
What was interesting was when I was standing up, my HR was constantly yo-yoing. I was only stood up for 3 minutes. But my HR went up to 102 immediately, then dropped back to around 85, then back up over 100 again, then dropped back down to 85ish again.
Going up to 80 after being 70 while sitting is normal. But going up to 100+ (30 or more higher than when sitting) when you stood means you have POTS.