As we discussed, there's a high cost to switching. When you go from one task to another and back, the brain takes a while to adjust and you simply lose a lot of productive time and energy. That's why productive people batch their tasks. That's why you don't check email every 10 minutes all day long. It's far more effective, you save so much time if you just answered all your email, preferably once in the day, maybe spend a half an hour, ideally, seven minutes in the morning. Then if you have to, another time in the afternoon, another specific batch, and then don't look at it again, till the next day.
That is absolutely the most effective way to be productive. batch your tasks. Do it all at once. Don't start an email, respond to a message on Facebook, look at a text on your phone. You'll be doing that for four hours. focus on one thing Finish it.
Ideally do that one thing just once a day, and then you come back to it the next day you'll save immense amounts of time, more time to be productive for the things that really matter.