All of my TTC stints were long haul ones....
With my first at 32, she took 10 cycles over 16 months. My first few cycles when I came off the pill were pretty long (over 40 days) and when I started tracking I didn't see any signs of ovulation. I then went to the GP when a cycle was hitting well over 50 days and had various bloods taken and discovered I had hypothyroidism. At the time of diagnosis that crazy cycle had hit over 100 days, but a combination of Levothyroxine and agnus cactus brought on ovulation, that cycle finally ended, my cycles settled to a much more normal 30ish days and I fell pregnant 6 months later! At the time my DH also had a couple of pretty rubbish SA results, to the extent that we were referred to the fertility clinic and starting to think that ICSI would be the only solution, but I actually got my BFP a few weeks after that initial fertility appt! But the fact that we conceived just a few months after the disastrous SA and I've had 2 (hopefully will be 3!) successful natural pregnancies just shows how fluctuating these things are.
DD2 at 35 took 12 sensibly lengthed cycles, although I had a CP at month 8.
This one (I'm now 42 and 5+4!) has taken 3 years! This TTC stint was prompted by a surprise pregnancy and early MC and I had a CP about 18 months in. Again, cycles have been more regular than they had been for DD1 and 2, which made it even more frustrating that I didn't seem to be getting anywhere. The cycle when I eventually conceived was going to be my last as it marked the 3 year anniversary of my MC. The only major difference this one was that we were doing Dry January. Obviously it's still early days for me (but I tested positive at 9dpo so I feel like I've known forever!) but I'll come back and update after my 12 week scan.
Re ditching the tracking, I think that only really works if you have truly textbook cycles. Even with these last 2 TTC stints which were a lot more predictable than with DD1, I ended up ovulating really late (CD24!) when I caught with DD2, and on CD13 this last cycle, when I tended to ovulate around CD15/16. I'd have potentially missed both had I not been tracking. Although it's maybe easier before your parents already and DTD every 2 days is much less sustainable!!