Actually, according to his book, DeMark states that you can use his setups on any timeframe. It is just important to remember the rules for drawing trendlines and the qualifiers for entering trades. He himself mainly used daily charts.
I am interested in how the 5 min chart is working for you Sweet Pip. Do you find that you get many fakeouts on a smaller timeframe or do the qualifiers do a decent job of keeping you out of those trades?