Question about Outlook.com Alias

Hi, I have reserved 2 Alias that I plan to use on my girlfriends hotmail account when she upgrades to an outlook address. Since she can't remember her Hotmail password and I was afraid of the names being snatched up, I created them as aliases in my Outlook.com account.

It's still possible for me to delete the alias when the time comes, thus, freeing them for her to upgrade her hotmail account right? Or is there a waiting period that we must wait for them to be freed?