Only one time use.
Think of like world leaders, celebrities, ya know 😉. Are you gonna make them do some embarassing things, or illegal acts.
My answer:
spoiler
Take control of an NSA agent with access to the most powerful hacking tools, hack everyone’s phone, install a program that randomly have a popup at random intervals, the popup message says “I’m watching you”. This also tries to spread itself to any other phone it can connect to. Pure chaos 😈
Pretty sure I can do this in a minute, depending on how good the NSA tools are.
To OP and others giving similar answers; ok, so you take control of the person…
Do you actually know how to do the things you say?
Using OP as an example, do you know how to use those hacking tools? Do you know how to go about hacking everyone’s phone? Because otherwise the only thing you’ll have access to for a minute is whatever is in arms reach of said NSA agent.
Shhhh if every movie director thought about movie plots deeper, we’d have 90% less movies. 😉