"Now my complaint is there are only 18 hours to work in a day"

Heston Blumenthal's quote speaks with the problem of accomplishing success in a world where there are only many hours in a day. He is revealing his aggravation at the truth that there is just a minimal quantity of time to accomplish all of the tasks that need to be done. He is likely describing the truth that there are only 24 hours in a day, and that after sleeping and taking care of standard needs, there are just 18 hours left to work. This can be a challenge for those who are trying to handle multiple tasks and obligations. It can be difficult to find the time to do everything that requires to be done, and this quote talks to the challenge of trying to make the most of the restricted time readily available.