After 2.5 days cooling, the cryostat reached the temperature ~60 K.
This value is my guess because the sensor had some problems and it showed higher temperature than actual.

Anyway, the refrigerator worked well though longer cooling time than before.
This is due to some insulators were not installed inside the chamber...
But it can be cooled down at some extent and I gonna do with this configuration.

I turned off the refrigerator around 20:20.