Brakes on a series are always a bit of an issue. But assuming the parts came apart easily I wouldn't thought more than four hours (?) on the outside, and more likely three. Th suspension bushes would have been a different story though. Unless he has one of those bush wacker things or an appropriate tool getting them out can be a real pain. 
Even still, seems a bit high to me. Last wheel cylinders I bought were about 15 bucks a pop (new but ****part and one had to be replaced after 5000km).
				
			 
			
		 
			
				
			
			
				Alan
2005 Disco 2 HSE
1983 Series III Stage 1 V8
			
			
		 
	
Bookmarks