At most every distro can take up to 10 Gb only. If you interested in games and wants to install them. Then A distro can take upto 20 Gb.
So you can allocate 10 to 20 Gb for a Distro.
Suggestion: Since you intersted in "multi Boot" , don't install Grub for all disto's. Intall only 1 grub.
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