There are really only 2 trends during the day for ER2, one within or after the first 15 minutes of trading, the next after the first 30 minutes of trading.
First Morning Trend
Second Morning Trend
After that, the volume dies down, and ER2 moves in a trendless fashion, and this is probably true for all the other e-mini futures.
After the 2 Morning Trends
Possibly, a third trend could happen in the afternoon, within the last 1-1.5 hours of the trading day, but note I said possibly. I have seen it trend in the afternoons, but more recently I've seen afternoons where the market didn't really go in any particular direction. What the afternoon is good for is that it gives you a hint as to the what might happen during the next day's opening.