It's better to count by hours. Say your teenager is 1yr, and today, and tomorrow you have to pause it for 6 hours while you're at school/work. Normally a Tama will evolve to an adult at 3-5yrs, but we're going to assume yours would evolve at 3yrs for the sake of example. So, you'd pause it for 12 hours total (both days you're at school/work). From the moment it hits 1yr to the moment it would normally hit 3yrs is 48 hours.
48 hours minus the 12 hours it was paused = 36. So, it would probably evolve sometime the very next day.
Hope I made sense, lol. None of this is official though, just my theory from having to pause MY Tama.