4 min warming time!

If it's too long, try calibrating the IMU after cooling the phantom somehow.
If it's cool where you are leave it outside for 10 minutes, some will put it in the fridge for a while.
When you do the calibration have your app ready to go and do it ASAP after starting up, as it soon gets warm just sitting.
The rationale is that in normal start up, the internals (especially barometer) need to reach the same temperature as when the calibration was done.
 
If it's too long, try calibrating the IMU after cooling the phantom somehow.
If it's cool where you are leave it outside for 10 minutes, some will put it in the fridge for a while.
When you do the calibration have your app ready to go and do it ASAP after starting up, as it soon gets warm just sitting.
The rationale is that in normal start up, the internals (especially barometer) need to reach the same temperature as when the calibration was done.

The phantom is not warm, the IMU warming up starts before each flight. But before use to take less than a min, and now is taking longer. Maybe because it's getting colder outside?
 
It's simple.. The temperature the imu was on while calibrating, is the temperature that it must reach on the next power cycle.

So.. If you did your imu calibration while the phantom was around 25C and it is now 15C outside, it must warm up until the 25C.
The imu sensors (gyro, accelerometers, barometer and magnetometer) values are temperature depending and during the initial calibration a matrix with temperature compensation is build up.

So as the others said, to long to warm up, cool it down below your normal ambient flying temperature and calibrate again
 
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