implantation bleeding

I'm on CD 32 (my cycles are ANYTHING but normal) and I had some light, light spotting this morning - pinkish brown and only when I wiped after using the restroom. I've had this with previous pregnancies, but I can't remember how long it lasted (or if that's even what this is). It was only maybe 4 hours this morning then stopped completely. So, how long did your implantation bleeding last???

EDIT: It's not abnormal for me to have 35-45 day cycles, so I'd say say its completely possible. 🤷‍♀️