How do you work out the opening and closing time this is adjustable with wheels.

The cam is 264 Duration , but when will it open and close and at what lift is this taken .020 usually OEM or .030" some american stuff but they usually go lobe center or .040 as the most used lift
Any way I have some cosworth 277 by 11mm lift that in need info on so watching with interest to how to work out the open and closing times