I reckon the bosch datasheet is missing a lot of information (i.e. gas response curves) that they have hidden in their proprietary BSEC software
using the read-all.py example
The sensors gas value/resistance varies depending on polling rate
at 60 seconds per reading max resistance 65000 after 5 hours
at 10 seconds per reading max resistance 132000 after 10 mins
at 5 seconds per reading max resistance 222569 after 10 mins
at 1 seconds per reading max resistance 222278 after 10 mins then is stable-ish at about 280000 after 20 mins
at 2 seconds per reading max resistance 233345 after 10 mins then is stable-ish at about 234000 after 20 mins
consequtive tests and air quality not changed that much, been running MQ137 and other analog gas sensors for several months already.
can someone else confirm this with another sensor.