The reason they're part of Utils is so they're reusable of course. That said, I might actually pull these out completely and go with WordPress' built-in `human_time_diff()`. The reason I didn't use it originally is because it only outputs one chunk of time (ie. "1 hour" instead of "1 hour 15 minutes") but for the sake of simplicity I'll go with `human_time_diff()` for now.