I don't think there's a limit. I used it today and it belongs to my wife. The intensity can be set before each use. The app serves as a reminder/planner.
Hi. I (m) have been using the device for 6 weeks - so I've basically had 3 sessions. The hair growth has been reduced by about 90%. After 4 sessions, more or less everything should be gone. This will become apparent in 2-4 weeks.
Basically, all hairs are removed equally well, but it also depends on the density and thickness of the hairs. The best thing to do is to read the FAQ: https://www.galaxus.ch/de/page/faq-zu-haarentfernung-mit-ipl-wir-haben-die-antworten-2381
No, unfortunately not.
Suitable for many hair and skin types
Philips Lumea Prestige can be used on many hair and skin types. Suitable for (naturally) dark blonde, brown and black hair and skin tones from very white to dark brown. Due to the high contrast required between hair and skin pigments, Philips Lumea, like other light-based treatments, is not suitable for treating white/grey, light blonde or red hair, nor for treating very dark skin.
https://www.philips.ch/c-p/BRI954_00/lumea-prestige-ipl-haarentfernungsgeraet/ubersicht