Yes, it's true that results may take a lot of time in generating significant results but it again depends on product mix, traffic, existing revenue per visitor,

Yes, it's true that results may take a lot of time in generating significant results but it again depends on product mix, traffic, existing revenue per visitor, etc. Haven't considered integrating lifetime value yet but it's an interesting metric. (Though, as a sidenote, most organizations are yet to start doing A/B tests, let along doing A/B tests and measuring impact on lifetime value.)