during the bored hrs of my previous job...
Easy - 6 sec
Medium - 36 sec.
Hard - 134 sec.
and it got to the point where if I did not get the 'coin toss' scenario, I could finished hard in less than 200 consistently.
and the random placement plays a lot with the time you can achieve.
no coin toss scenario gives you the best times.
yep, it's addicting.