Thanks feneur for you reply.
I surely don't know who could be the chosen mentors and how much time each one would have but I'd like to bring to your attention that many organizations actually states in their SoC projects pages that the mentors will not have much time and actually enforces it as an eligibility criterion to students applying, that the student would be able to adapt to this.
Furthermore, many organizations actually selects their students from their active contributors who may not qualify as mentors. Such students would even require less time to mentor.
I know this would not actually make a huge impact but I just thought to share.