Yes the $213 daily is paid every single day of your 6 weeks even when you have a day off.
In Nigeria (by local law) you must have one day off per week, in other country things are different.
Monthly average is about approx 70 flight hours (+ or -). On a busy day it's possible to make 6/7 hours of flight, then on a quite sunday you go to the hangar and sit all day doing noyhing.
Extended tour is no so common, only when there is a shortage of pilots. The company doesn't like grounded aircraft due to lack of pilots.
On extended tour you get an extra $200 daily on top off normal salary, this make $513 daily in Nigeria (213 + 100 + 200) plus your basic monthly salary.
Officially you change country every 3 years, but with the big needs in Nigeria, you can stay there much longer.
Keep in mind that everybody wants to go to the good places, so don't hope too much.
The compnay provide ALL TICKETS, you won't pay anything, and if you have like a day stand-by in an airportwhile travelling, they book an hotel room for you.