Now night time. That is like 6 hours minimum for the night owl and up to 12 hours for the one that sleeps in. And for some that can be anywhere from 8 hours to 24 hours per typical day because they are home most days (no job, partner who stays home, at home parent, etc)
I would think we could assume 7-8 hours average for the people who use their phone from almost constantly to constantly. Given the incentives they might put phone on charge while playing their games and increase the time to average of 12+ hours
For most others given the incentives to be on charge we could assume 10-12+ hours on charge. Yes I know they would not charge that much now, but given the chance of safecoin then those who do farm on charge will do it much more.
Now at that number of hours we may see much better chances of farming being successful. I know the aim of the team is to have mobile devices on charge/wifi do farming, so I am sure that there will be either “mini farm” vaults or the vault algo will allow this.
I would say that vaults that meet minimum requirements (on enough to gain age) will be able to be turned off and rejoin without having to effectively restart. So a phone might not do as well (per hour on) as a SBC which “never” disconnects, but at least it will do something.