3 month contract
There is a whole other issue to consider here. Nigerian aviation is a completely different animal. The ATC procedures are very difficult to follow. The ATC radios are very difficult to understand (especially Kano Control). Other aircraft will lie to ATC, stating false locations, false altitudes in order to gain advantage. Do not even consider taking off with an inop TCAS. The controllers will lie about the actual weather conditions at their airport. You will have to fight for transmission time, as everyone is talking over each other. Understand that your GPS NAV is more reliable than the garbage ground based NAV aids. Do you have experience with ITCZ thunderstorms that routinely top out at 50 or even 60,000 feet? Did you know none of the runways in Nigeria are grooved? Did you know Lagos 18L routinely floods in heavy rain? How about sand storms?
It takes a minimum of 3 months just to grasp what you will be expected to do on day one.
I wish you good luck. I hope they are offering you a lot of money. I hope you get the money they are 'offering'.