I am not a CFI. I am a student working on my PPL. I can tell you a little bit about my school though.
It is based in an affluent area at a class D airport. Part 141 school. About 50% of students are career changes and 50% wealthy older men getting their PPL.
Every CFI right now is doing around 85-100 hours of flight time per month. Sessions are booked in 2 hour windows. Most the ground school is done online through king schools. The ground school is mainly briefing and debriefing before and after flights. You are expected to learn the majority of material from the online school. Most CFI’s are working 6 days per week. 0700 - 1900. Long hours...
Based on things I have heard, if the CFI’s are super busy they may be making somewhere in the low-mid 30K range. Maybe more including the ground school? I believe they have health insurance and benefits through the school.
Most the CFI’s are getting their hours for ATP in about 1.5-2 years. One CFI went from 0 to 1500 hours for ATP in 2 years.