That is a correct approach if you are a very quick trader, if you plan is to buy it and sell it within an hour then you should definitely consider putting it as short as possible and including as many points as possible at the same time. However if you could wait a bit more then you could take it a bit bigger as well, like for example you bought today and max you can wait is until tomorrow? Then you can enlarge the period as well, whereas if you bought it today and can sell it anytime within a week? You could take it in a huge margin.

So, it depends on when you buy it and when you want to sell it and generally you make it linear, shorter the trading period shorter the indicator checking period as well. I personally deal with 1 hour because I just like to trade within a big margin, all those 5 minutes mean nothing to me because it would require me to constantly check it.