WetWebMedia says 0.001 SG increase per day from hypo. I shoot for that but end up raising it a little more quickly.
Yes this is the "ideal method/rate".
Mostly the way I do so is (and this works well for adding to an established tank too) Is to over fill my sump, if you can, to drop the salinity, and then let evaporation slowly take it up to the tanks normal level. That way I'm not having to play test it every 12/24hrs
If I have an established tank @ 1.025, and a fish coming in @ 1.017 (which by the way does not kill marine Ich so why they bother with that level is beyond me) Then I will take the tank down to 1.022, or lower if the corals don't mind, but the inverts are not too pleased down there.
Then go ahead and put the fish in fairly quickly....salinity wise there is no real difference in a 30 min to a 4 hr acclimation.
The much larger thing to be concerned with is 1st ph, and 2nd temp. So if those things are at a substantial differential, then a slow acclimation is warranted/recommended.
My "Theory"

on this is, it's best to get the fish in his new natural like surroundings right away, yes it's a .005 jump....but it's not a .008 jump.
I have had much success with this method.....it works for
ME, and so I stick with it. Others have their methods, this is mine, so take it as such.