You are always going to have a satellite phone on you and can call back. It just depends on what kind of stuff you are doing, there are a few times when you have to work all night or fly. In those cases maybe you won't be able to call…but 90 percent of the time you will be able to call them. On some deployments you might even be able to get a sim card for your cell phone or internet in your room, it also depends on where you’re deployed. But in my experience it is the best practice to not have/plan specific times to talk.