at the moment, the crypto market is going through hard times, but we still hope that the market will grow in the new 2019 year and we will earn this time. at the moment, just have to wait and hope)
I guess no need to wait for a long time to make a profit because if you see on the market, many coins can rise and some of the coins break the higher wall, so it is good to try to buy and sell. But if you decide to hold for a while, then it should no problem to you because you can hope when the market recovers, that is the time for you to take your profit. But unfortunately, we don't know when the market will rise, and if I were you, I would try my chance to trade because I don't want just wait and see and hope and I don't think it's a bad idea to try.
You could definitely do short day trading specially in this market conditions. It's not advisable though for newbie traders as they are going to be overwhelmed by this experience. But there's no harm in trying, but you need to be have total control of your emotions and just invest what you can afford to lose.
And when you gain that needed experience then you take a gamble and invest more and see how it goes for you, and I do hope that you make a good profit out of it.
Yes, ones could still have some profit doing short term form of trading but it definitely not advisable newbies and I believed some experienced crypto traders doesnt worth doing short term trading in this current market due the no conc patience level and controls of ones affection which is what leads to alot of crypto traders or investors lost.