Just to clarify, I do not treat any fish, invert, or coral unless necessary. My qt (as stated above) is at standard reef parameters. I have treated previous fish for ich using hyposalinity (which is a continuous control of salinity and difficult for some hobbyist) and was successful in my attempts. The lastest fish losses were in the EXACT same water as my 2 year old reef (water is pulled from there via siphon near the water surface) without any treatment to the fish.
Yes, typically 20-30 minutes of transferring water would be ok, but going on a slower acclimation (drip 3 hours) minimizes risks vs water transfer when bringing home livestock. Cycling your tank for 4 weeks is recommended, but cycling it for 12 weeks has a better result (IMO). Nothing, again, nothing in this hobby is rushed. Moving a frag of sps to the top of your rocks after you purchase it because it likes high light (according to online sites) would probably end up bleaching out. Instead, starting at the bottom of your system then slowly adjusting it after some time.