There is no such rule.
If you are some day making more pips than is your targer you surely won't stop and trade even more.
If you are some day not makinmg enough pips you surely not meet the target.
The question should be ho much profit should you make per month to make your trading time worth it.
For me target is about 5% and I am slightly below that.
i never put a target on a trade .
i follow the trend if i decide well then there is no such thing then 10 pips a day .
i never put a % on mij trade bij month of corse i am not scalping ;
my trades run hours or even day s. i am trend trader
for % by month is variable some times 10% sometime 20% en EVEN 80%
en i trade al pairs when they are ready to trade
so i wiat en let the trade come to me .
not chasing the market .
like the most are doing .
everybody whants to scalp
but that is specialist work .
not for the beginner .
i have now 13 orders on 13 different pairs .
i trade to make money not to be right