Egypt is 2 hours ahead.
They are the most nocturnal people I have met.
They don't start calling anyone until about 11pm at night. My H aunties kids go round to her house most nights - with 2 DC under 7 - no earlier than 11pm.
DC never have a bed time and are literally routinely squealing and shouting at all hours of the night, 3am, 4am 5am. I am not kidding. Boys are never, ever told no, and are raised to believe that they are entitled to live exactly as they wish and women will never ever tell them what to do. Not their mothers, not their sisters and certainly not their wives.
If he wants to speak to his family etc in Egypt. literally there is no reason on gods earth why he can not do it at the END of his day. In other words he stays late to do it. In his own time. 5m is OK, but an hour? No.
Some may think what I am about to say is mean, but it honestly is true. Manners are, how can I put it, not exactly their speciality, nor is consideration for others or wondering if they might be inconveniencing anyone.
You have to tell him, STRAIGHT. No pussy footing about or talking to him in a roundabout way. Direct, and to the point and with no 'wriggle' room.
"Colleague, your hour long phone calls in the middle of my work day are disruptive. Can you please do them in your own time, when people have gone home, and you are not disturbing those around you."
He will never, ever in a million, billion years cotton on to the fact by himself, that he is irritating you to beyond murderous. Oh and even if he is some kind of genius and miraculously does work it out, there is a massive chance that his sense of male entitlement will rule out any form of self moderation.
The one good aspect of their cultural make up is that they never ever have any retort. They never answer back, and even if they do, a sprinkling of indignation from you, hold your position and they will usually just fold. Stick to your guns and you will get what you want.
Been there, seen it, lived with em, got out just short of murdering em. 