If you are trading on the shorter time frames you have to trade a lot of hours. You are constantly looking at the charts trying to find the right setup to enter.  The trades come and go. They are small so you have to do a lot of trades to make any money.
When trading on the longer time frames you have to spend less time in front of the computer. There are only going to be 1 or 2 trades per currency pair per week but you will be in them longer and make more money than you do trading the short time frames.
I feel that the key is on the 4 hour chart. You only have to look at the charts every 4 hours. By scrolling through 19 currency pairs every 4 hours you are only putting in about 10-15 minutes. The time will be less once you get the hang of looking for trades. When a trade is entered set your stop loss and target take profit and come back in four hours and see if you need to put on the automated trailing stop or not. You will find that you will have 2 to 4 trades on at any one time. Some of them will be starting out and others will be well into some good profits.
To try the longer term trading you might consider opening a 2nd demo account and only trade long term on that account. Try it; you will like it. On your other account trade the way you feel comfortable you will still be developing you skills. All the trades are coming from the same signals just from different time frames. Every day you will get one or two situations that look and feel right. Just be patient and wait for the trades to come to you. You do not have to try and beat the market all day long.
For those traders that are interested in longer time frames you can look at the Launch Pad trading system for help.