Don't leave your seat.
It's not about working longer hours.
It's about maintaining your focus on the task that matters.
It's easy to keep switching contexts from the work that you need to do to the unending distractions vying for your attention.
But if you keep doing that, you spend a lot of energy, time & attention without getting anywhere.
Instead, focusing on a single project with a timer can help you gain significant ground by working 3-4 hours a day.