Only get the quest on your main. Maybe even 2 of them. (never seen a NPC with more than 2 quests) Time, 2-5 secs.
Push 'L' to open quest log. Time, .1 secs.
Scroll down to new quest(s). Time, .8 secs.
Click share quest. Time .1 secs.
Alts automatically accept quest. Using addon-time, 0 secs. Using accept macro-time, .1 secs.

Only having to do this once every 10-20 mins, not bad.
For quests where you have to each accept it (quest item non-shareable quests), just all select NPC and then addon makes the alts select the same option as the main.

I use Multiboxer v2 (http://www.dual-boxing.com/wiki/inde...n:MultiboxerV2)

For macro, can do more in it, but mostly
/script AcceptQuest();
For escort quests, very important, only 1 person get quest and rest of alts just accept it, if they try to get it also, it doesn't work for them.
Good luck.