This question cannot be answered directly, because it is depend on our leverage and capita. I think a trader should use a reasonable lot size, don't use a bigger lot if our balance is small.
for me i just make target 1% from capital per day. ex : i have $100 so i trade 0.1 lot and the target its only 10 pips.
I think 0.01 from $10 is good lot size.