It doesn’t mean 60hrs/week. It doesn’t mean 30 or 40hrs/week either. In fact, It has nothing to do with the amount of time spent “working”.
It has to do with being responsible and dedicated enough to do your best in being consistent in finding your flow. Every single day. Even for just a few hours.
“People are interrupting me every time”.
Start with you appreciating others flow. Force yourself to avoid interrupting others. Especially when they clearly don’t want to be interrupted.
Try that for a few weeks. If that doesn’t work, continue by expressing your dislike towards being interrupted. Without being a dick.
If that doesn’t work, move on and find another job.