Hi, you've probably found out already but for anybody else....you can get a max of two x 15 day extensions. I got mine in the douane office in Dakar. Get a numbered ticket at the reception desk on the ground floor and go up to the fourth and wait. I waited about half an hour, saw the man and had to pay 2500cfa for a ticket stapled to my original passavant. The hassle riding in an out of Dakar, even having used the péage made it unlikely I'd do this again in Dakar.
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