I started playing on the 3rd, didn't immediately start grinding the event becasue I was clueless, so many on the 5th I'm actively playing.
I managed this, didn't use perfect energy usage or whatever a lot of the time I let my stuff cap but I did a lot of career runs with the event point + cards.
tldr: you can do it in 5 or so days the event lasted 3 weeks.

The only things that might fuck you is if you care about the title and the bingo, I really don't know how you're going to do the bingo with out at least 10 days or more outside being a luck god.