But evryone can do that with TA, so there is no edge in the use of TA. --The edge in trading lies in the ability to utilize Prudent Money Management with regard to management of the trade once taken.
No, once the trade is taken TA should tell you too how long to stay in the trade. But unfortunatelly not everybody can do that. That's part of the edge. You see TA as finding the entry only, but that's only half of the job.
And about that Prudent Money Management, the better the TA the less you need a sophisticated Prudent Money Management. In fact my Prudent Money Management is a stop on X points that's all. And it works perfect because TA tells me when to get out BEFORE being stopped out.
My average holding time intraday is probably from 1 till 6 hours. That's why I use TA.