How long are your cycles?

VanaC

What's the longest cycle you've had and what was the cause (if you knew it) mine is 71 days as of today and I can't even count how many HPT I've had that have all came out NEGATIVE. I have no idea what's going on, I've been to the doctor and they say to wait it out a week or 2 and if it hasn't arrived they would do a blood test. Wby girls? What's the longest and the cause?