Texts, emails and phone calls can not only make homework time become longer, but may lower the quality and thoroughness of the work. In fact these distractions could cause 45 min of homework to be stretched out to 2 hours. Many kids (and adults) are addicted to checking social media and texts. As parents, it is up to you to help them remain focused on their work.
One way to do this is to allow them a 5-minute break after finishing an assignment to check their emails/texts/social media. Then have them go back to work on the next assignment. Allow them another 5-minute social media break and follow this pattern until all assignments are completed. Another take off on this idea would be instead of alternating breaks between assignments; you could have them work 20 minutes and then 5 minutes off. Follow the time pattern until all assignments are done. This will allow students to focus on schoolwork and satisfy the urges most people have to attend to their social media or texting.