What should I expect from Turtlebot calibration? / How do I know if my Turtlebot is broken?

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I'm having a hard time debugging my Turtlebot because I don't know what a functioning Turtlebot should look like. Now that I've read the source code for turtlebot_calibration I have some better understanding of what to expect, but I'm still not sure if my bot is mechanically broken.

• Is it normal for Tbot to stop for long periods of time during the calibration routine?
• Is it normal for calibration to take 7-10 minutes, or more?
• What are some examples of reasonable values for gyro_scale_correction and odom_angular_scale_correction (for a gyro_measurement_range of 150)? Is a gyro value of 0.3 completely unreasonable? What about 3.4? Should it be much closer to the default?
• What is a normal error range for odom and IMU? Even on a good run I might see an odom error of >10% and IMU error >40%.
• Is it normal for the bot to drift out of place during calibration? (i.e. it doesn't turn in place perfectly, but drifts a few centimeters over the course of the routine; one wheel must be spinning faster than the other, I guess)
• Also, what kind of error is acceptable overall (from the EKF's odom_combined) to be able to run gmapping? If I rotate 360° while watching the output of rosrun tf_echo odom base_footprint, should the yaw delta be within 1-2°? Or can I accept errors of more like 10-20° and still be able to run SLAM?

Here's a video showing my bot doing calibration (I know it over-turns right now so the numbers aren't correct, I just want to show you how it stops for long periods of time making weird noises, e.g. t=0:50): https://www.youtube.com/watch?v=8X8Sm...

I appreciate any clues you can give, even if you can't answer all of the questions above. We can collaboratively put together an answer here.

Edit: Seriously? No one is going to even give me a hint of whether they think my video looks normal or not??