This is a good question.
It is not the time matter here But it is the quality,smartness of work and commitment on work matters.
You can work for a long hours which may yield no result, but you may with commitment and smartness the work can be done in shorter period and bring the desired results.
Rather than spending a longer hours work smart with dedicated commitment.
This kind of work will bring better results
aim for a result oriented work than time bound work.