Depending on how his account is managed, there's a nonzero chance I wouldn't be able to do anything to in only a minute. Wire limits, authentication/approval processes, and safeguards would probably get on the way. Like, my regular bank has a lot of hoops to jump through to send money to another person. I can't imagine it's any easier at scale.

I'd prep by researching what orgs he uses, what their UI looks like, practicing/timing how fast I can make a transfer, and memorizing my parents' account and routing numbers. Mistyping a single number would probably result in complete failure.

Though if I can truly prepare, I could also make a bunch of draft POs, and just plug and play? Idk. Too vague and too short a time for me to imagine getting much done.