bru vs nse geology, page-13

Bhutos, the 300 mmbbl is an estimate, not a contingent resource? How much work to get that books as a contingent resource, and how much work until some of that becomes reserves?

In terms of doing a net present value calculation, would it be reasonable to assume they would have about a 10 year extraction period once in production before the wells are 90+% depleted? Not looking for anything precise, just trying to get a good sense of timing order of magnitude.