Without being too flippant, monday-friday are good days to trade.
Each of these days brings the potential to be a good day. But you have to be there to take advantage.
This suggests that part-time trading is doomed to potential failure as you are bound not to be there when it all happens!
As they say if you treat trading as a hobby, it is bound to cost you money as all hobbies do!.Trading is a full time job.