I cycled this route from 25 - 27 Jan 2019
250km out of 312km are tarred.
The first 30km are tarred.
Then 50km of tracks, through villages, sometimes deep sand, difficult to know which tracks to follow as people seem to drive where they like. The locals advised to follow the power lines (which lead to Khartoum).
I've marked this section in red below....
My Arabic is minimal and that scan is pretty blurry, but the word next to Duration looks an awful lot like شهرين shahrayn which indeed means two months. (Fun fact: Arabic numbers have a dual case, which means you don't need to write the number 2 explicitly!)
It's not clear to me if means you get two months from entry, or if it's just repeating the valid-...
Presuming that's the annual rate, which the most common way for inflation to be expressed, that means that the average price of goods will be average 60% higher in one years time.
Meaning, something that costs $1 on 01 JAN will cost $1.60 31 DEC. When prices actually increase is dependent on the merchants. In this case, merchants would raise their prices ...