I've done 4x 70/70/70 in 3 days as my best record, time wise.
Quests and skilling for them takes under 3 hours
I'll be happy to prove it after my current services are completed
You guys can always apply the fundamentals that @Chuckle has taught in this thread, to modern items that have a high trade volume, with medium to low (preferred but unlikely) competition and still make complete bank.
Will do this withing 3-4 days tops. Hand trained, pm me if you're interested. I understand i'm relatively new to the forum, however, I have a good bit of experience.