Mash on at 2.30pm 3.45 mash out... pulled off 27L instead of 24.6
Based on boiling 27.00 gallonsliters at 1.050 for 70 minutes, this will decrease your wort by 4.67 gallonsliters, bringing your after boil OG to 1.059. You wanted an OG of 1.066. It looks like it will be under.