@Ramhound Thanks, that helps. With the details from your comment and DavidPostill’s, I’ll accept the decision on my question.

@DavidPostill Thanks for your comment. Isn't the Skype question of a similar scope? I've addressed the mobiles issue in the meta above but if you've considered that, I'll accept it. On being opinion-based: sufficient live testing should be able to provide a useful range, so answers can be fact-based (which I'd prefer for this question) rather than opinion-based. There might even be some data out there but I haven't been able to find it, hence the question.