How Long Do I Have To Maintain A Github Repository?

Location: Canada, MB

The short of it: I am the owner of a GitHub repository and have tried to transfer it to a person I interned for. It's been two weeks and he hasn't accepted the transfer of ownership. How long do I have to wait before I can remove myself as the owner of the repo? Removing myself will delete the repository.

Longer story:

I interned at a small business for 2 months as part of my course work, unpaid and fairly miserable. I created a web app for the business, with most of the files being saved on GitHub. The owner was informed on the last Wednesday of my internship that the handover would take place on the following Friday. I initiated the transfer of ownership of the GitHub repository 2 weeks ago and the person I interned for has not accepted the transfer. I didn't leave on great terms, not horrendous terms or anything, but enough that I don't want to be associated with this business anymore or do them any favours. Is there a certain time frame in which I can remove myself from as owner from the repository, noting that this will delete the repository? They've already been told to accept the transfer, but can I just give them a time limit to accept, say 3 working days and then delete it?

And just to note for those that don't know, a GitHub repository is basically a place to store and collaborate on writing code.