Recently, I have been raising a P1. I do believe that they should have more or less similar growth times to a P2, but I am not certain.
I always start my Tamagotchis in the morning. If your Tamagotchi is born in the morning, the times should be very similar to mine below:
Babitchi to Marutchi
Born at 8:00 AM, transformed at "Age 1" at 9:00 AM
- Total Time: ~ 1 hour as a baby
Marutchi to Tamatchi
Transformed at Age 3 at about 11:10 AM
- Total Time: ~25.17 hours as a child
Tamatchi to Masktchi
Final transformation at Age 6, around 12:10 PM
- Total Time: ~ 34 hours as a teenager
Keep in mind that I have only calculated the time that my Tamagotchi has spent awake. I don't believe the hours your Tamagotchi spends sleeping affects the speed of the growth.
I know that the vintage Tamagotchis do take much longer to transform. The actual times does vary depending on the model, but the P2 should be very similar to the P1.
Edited by nerdbot, 01 December 2013 - 03:23 PM.