Trading should go with schedule inorder to track ones habits and progress, I know that some people tend to love weekend trading because it gives them the opportunity to rethink, restrategize, and make good decisions in regards to the trading, some say they get a different mindsets whenever they trade during weekends either ways a trader goes with what works best.
Well, as far as they are trading rightly, it doesn't matter of it should be on weekends or week days, all that matter is that they are doing it in the right way and with the right mindset, and also the should trade with the amount they can afford, because trading is not something one can predicted as the market does fluctuates but having the right information will help them in achieving their goals and will have lesser chances of losses.