How long are you supposed to have spanking bruises? When is it too much or cause permanent damage?
That’s going to be dependant on the individual, the extent of the bruising, where the bruising is and whether the skin/area already had damage to start with (spanking on existing bruises is not a good idea).
If a bruise hasn’t substantially gone down in 2 weeks or if it is very painful or accompanied by swelling or issues with movement of the area then you need to get it checked out by a doctor.
For me the bruising is essential. I love to carry the bruises with me for as long as I can.
Typically they last 2 - 4.days but my wife has Parkinsons so her strength is limited and so are the blows she can deliver.
@angel7
We need to stay safe and I always encourage others to use safe commands- green - good to go and continue, yellow slow it down a bit and red to stop
My husband lives to see marks and bruises on his bottom and top of the legs and they fade after a day or two - I say never use anything to cut the skin or cause bleeding- be safe at all times - but as others say - it’s part of the fun 
Hubby and I love a good bruise but mine are usually gone within 4 days tops. My golden rule is only to the really plump bits (buttocks/thighs) and absolutely nowhere someone might see (eg face). I hope that helps 
Also, as @batjamboree said, don’t forget communication and safewords!
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