u/Cultural_Revenue_808

I have an upcoming visa appointment for single entry eVisa to Japan and was wondering if anyone knew how long they typically give the visa for? My itinerary and plan is currently set for 7 days but I might extend it later on. Would they give me the visa for 7 days only considering it's my first time applying or could they give it to me for longer?

Also, for proof of relationship to my sponsor, would the birth certificate in Arabic suffice? Or do I need to get it translated?