Estimate download size of android source from repo sync

Hi all,
I am using this command for downloading android source for kitkat 4.4.2, "repo init -u https://android.googlesource.com/platform/manifest -b android-4.4.2_r1" then after I used "repo sync" and I checked that it is almost downloaded of size 22 Gb but it is still downloading, I am confused and having no idea about its actual download size, please can any expert give me estimation of its download size..? I am waiting for its download completion.

Thanks,
Adeel