Hello Sigurd!
You should really get yourself a high-powered loupe or magnifying glass - 20x - 30x would be ideal. Then you can assess what the damage actually is.
Quoting how may laps you need to remove the damage is a bit like guessing how long a bit of string is, though! If you have a major chip to the edge (something as small as 1/2 a mm is quite big) then you will need to do a lot of laps. And I do mean a lot on the 1000 grit. The trouble is, in doing that you are still honing the parts of the blade that do not have any damage and you risk over-honing those parts and creating a wire-edge. If I have to deal with anything from 1/2 to 1 mm I will lightly draw the bevel evenly over the coarse hone (I use a diamond plate) to evenly blunt it throughout its length. Then, to avoid over-flattening the spine I tape it (1 or 2 layers of electrical tape) and hone until the bevel is set again, replacing the tape as necessary. You can tell when the bevel is set by moistening your thumbnail and drawing the blade lightly over it - if it seems to skip/bite/skip you have damage, possibly from bits breaking off from over-honing, if it glides smoothly over your thumb it is blunt, if it tries to dig in and stay there you are ready to move to the next hone. Only try this test with stones up to 1000 grit, though - it is too blunt a test for anything finer and will damage the edge. You should test along the length of the blade - all parts have to pass the test.
If you create a wire edge, back-hone (spine first) for 3 or 4 laps, then hone normally for a few laps and examine the edge. Make sure all the craggy bits have gone. If backhoning does not do it, you can give a few normal laps on a coarser hone, or gently draw the edge through a bit of cork or over a matchstick.
Once the bevel is set you are just refining it. Hone until you pass the TPT test - Thumb Pad Test. Moisten ball of the thumb and lightly draw it down the blade. The blade should feel "sticky" - that is, it is trying to bite into your thumb. If you are too nervous for that, shave arm hair instead - it should shave without any force being applied. Then move onto the next hone. TPT from now on.
The greatest amount of laps will be on 1000 grit if there is damage, and you will need quite a lot on the 6000 grit because of the comparatively large jump between it and the 1000. On the Naniwas, maybe 30 or 40 full laps on each should do it. Some people say 20 is enough, some go for more than 40. You need a light hand and constant testing.
Regards,
Neil