If you have to _guess_ someone's availability, then their local time with some knowledge about their lifestyle is probably the best indicator. But technology al

If you have to _guess_ someone's availability, then their local time with some knowledge about their lifestyle is probably the best indicator. But technology allows us to communicate at almost light speed, so we don't have to guess anymore. I can just try calling and if it doesn't work out then we can at least use async messages to schedule a syncronous session. Eventually, if it's a regular thing, you will learn when to call for a successful sync session regardless of how we describe time (as long as there is some periodicity to it).