Just curious: is there any particular reason that the time spent nursing decreases only in six-minute increments? It's a wee bit maddening near the end to see a woman have 0 minutes of nursing left... for six minutes.

Crops are timed to the minute, just wondering why nursing isn't as well.
_________________________
"We're immortal, Buffy. We can do anything!"
"Oh, yeah? CLAP!"
- Buffy the Vampire Slayer (the movie)
Zoe: "Wait, this is something the captain needs to do for himself."
Mal: "No it's not!!"
Zoe: "Oh, right." (runs to help)
- Serenity