How many times has the territory of the Arab state increased from 630 to 750 g

From 630 to 750 the Arab state (Arab Caliphate) has grown 4-4.5 times. However, it should be noted that even with the rapid conquest of territory, most of the lands of the Arab state were unsuitable for agriculture deserts of the Arabian Peninsula, with insignificant oases in the middle of the desert. Nevertheless, along with this, the Arabian Peninsula was strategically important because of the caravan routes passing through it, with a corresponding economic benefit for the Caliphate.