How Much space will I need for developing apps

I will be purchasing a MacBook Air most likely the $1109 with 64GB and 4GB RAM,  I was wondering is 64GB okay for developing apps and personal use.  I use about 18GB on my PC and I'm thinking I'll only need about 20GB MAX more, so 38GB used in total.  Is the remaining amount good for developing apps, excluding XCODE itself, just the coding/ files needed?
THANKS

If you need to run XP then since BootCamp no longer supports it, your only choice would be on of the virtual software packages to run Windows.
Allan

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