To write a 700-word essay in 1 hour (not entirely from scratch, mind you, but the original copy was left at school with several original thoughts) it is best to follow to schedule below.
0-15mins: Write 250 words
15-30mins: Write 250 words
30-45mins: Write 250 words
58-60mins: Polish format and submit
Let's see if I can do it. Will report in approximately 1.1 hours.