+1 Great infocoral is far more resilient than most people think... dont worry about crushing GSP (but don't beat it with a hammer either) and most corals are ok out of the water for minutes, and some for hours...
I like to use superglue gel. I put it on the plugs and let it get a thin hard layer before attaching my frags. then I give the frag a minute ~60 seconds or so, then put the frags in an area of my growout that has lower flow. Once I am confident that the frag will stay on the plug, I move it to where it needs to be.
To do most SPS corals, I suggest letting the glue get even thicker. It make it a lot easier to stand up acros etc.
There are several species that have adapted to tidal regions and can be exposed for a very long time. Most other coral is simply hardy enough to withstand the exposure to air.
Keep in mind, temperature and light are a huge factor in this. The water protects the coral from UV light, and if your coral drops to 72*, it won't matter whether its in saltwater or not... cold is... cold!