thoughts?, page-24

Yes looking for a return on the prevailing market cap.

Modelling the cashflows depends on the experience of the modeller and on how predictable those cash inflows are for the company.

So could be 5 - 30 years for argument sake depends on the company.

And yes you do need to decide on a perpetuity or liquidation value @ T10 or whatever year the modeller is confident in modelling to. But liquidation is pushed back to the insensitive end of my model so I can choose to be as optimistic or conservative as I like without materially affecting my decision of investment .