I plan to trade several times per day. In theory the more you trade (provided your trades are profitable on average) the more stable your strategy can be considered, i.e. being profitable over 1000 trades is more significant than being profitable over 100 trades.
There are number of factors which should decide how many trades you take per day. Do not make the mistake on chasing trades and looking for opportunities, let the markets come to you. You should not have a goal of making x amount of money or x amount of trades.
Your goal should be to follow your strategy, if you do that then you should make money. People who say they should make £x amount a day or feel uncomfortable not making a single trade in a day often chase trades when the market is flat which damages accounts.
A long time ago I use to trade the London Open from 0600-0900 GMT and then the US Open 1430-1730. I would make about 6-10 trades a day on average trading off 5 min charts. These times were when the markets were most volatile and opportunities were most likely to present themselves.
I then traded from 0700- 1800 trading off the 15 min charts. I would typically make 2-4 trades a day.
Now I trade off the longer term charts and make 2-3 trades per week. I am happy to say that I enjoy trading much more, I can do the things I love and I don't have to sit and watch screens all day! Yes I don't make quite as much but my equity curve is smoother and still make a decent return.
I trade 3-5 times a week, sometimes less, sometimes more, it all depends on the market. There have been weeks when the market's been highly volatile and I've traded a lot and weeks when the market's barely moved, so I did nothing.
I do not have a fixed schedule, but assuming a day of several trading opportunities (that match my trading strategy) sometimes I trade as much as five times a day. Nonetheless, on average I think it's about 1-2 times a day, which is why I consider myself a swing trader. All in all, I think try to stick to my strategy, thus avoiding some trading opportunities that do not align with my goals.