It depends on your trading strategy. But in general, chart timeframe simply means how fast you want the candles to be forming. So it depends on how much time you have on your hands.
If you are going to keep your trade open for a short while, you could focus on shorter time frames between 1 to 15 minutes.
However, if you are going to leave your trade open for a long time then you should also look at higher time frames too.
But like I said earlier, there is no particular rule to the timeframes you should use, it is dictated by your strategy.