Not sure what you mean by limit. Be useful to know the size of drive in total initially.
Taking a guess as an example .... say your HDD was 30Gb. Make your C drive for system a third of that or even half ... space 'disappears'' on system drives! With remaining space make logicals to suit choice -- so maybe 15Gb for system and two 7.5Gb logicals.
You'll have to state your question more precisely tho.