1 - Are you leveling your R-A-F characters with or without the help of a third (presumably higher level) character?
With R-A-F it is entirely possible to level 5+ characters to level 60 in under 22 hours played. My personal best times were about 18/19 hours for 2 characters up to 60... and about 25 hours for 5 played up to 60. My worst time was about 3 days played for 5 characters (before RAF) to 60. Others have experienced similar results, but your mileage may vary (most of us have done the 1-60 grind multiple times... your times will improve as you figure out the best routes, etc.)

2- It's not necessary to install a second screen - unless if you like to have wowhead.com or some informative site up to accompany you while you go through quests.

3- Maybe someone else has a better answer for this. For me, I accept with 1 character and then hit the *share quest* button. This works for about probably 95% of quests in WoW, except for those where an NPC gives you an item; in which case I click through the npc/quest on all of my toons.

Cheers :thumbup: