How long can or does implantation cramps last?

I'm 8 DPO today and haven't tested as I believe it's too early to test, however yesterday I had some sporadic AF type cramping during the day and then nothing this morning until now where I feel AF type cramping again. My cycles are between 24-26 days and I'm on CD23 today so not sure whether this could be implantation cramping or whether it could be AF cramping (even though I never get AF pains unless AF actually starts)...

Any information would be greatly appreciated.

Thanks! :)

I think I read somewhere it can last between an hour to about three days. Fx for you it's implantation and af stays away!

Thanks ebn_d! They were gone by this morning but started up again a while ago, coming and going although very mild cramping, just basically enough to notice them. Caved and tested but a BFN, but only 9 DPO or perhaps even 7 DPO so way too early. Thankfully AF hasn't shown... :)