Day 15, still trying, best time so far - 40.14 seconds. Props to the dev for making a game that's, at its heart, DIAS (Do it again, stupid) while actually managing to hook the player (me) up.
Out of time? More like 'out of garage' since, as long as I make it past ~1.5km, I can not die of running out of time thanks to the plentiful zombies. I have even gone up to 7 minutes, and a streak of 29, when each zombie was giving over 10 seconds.
Yes, you have to get all platinum medals in challenges (1800pts). But also you have to get both platinum trophies for Reward and Distance.