Id say about an hour or so, however, the weight you lose with only be water weight.
You can use sauna everyday for about 60 minutes.
You don't use sauna suit in the sauna.
There is no age limit. I was a baby when I was first time in sauna, so I would guess when the baby is old enough to be on the sandbox on the playground and as long as the heat in the sauna is not really high and someone is supervising the small child, it's okay. The time spent should be very limited as the stress put on the child's circulatory system is high.
It is safe to use sauna every day, as long as you don't do it for long periods at a time.
Yes, as long as you keep yourself hydrated. If you feel uncomfortable, nausea or feel like blacking out, get out of sauna and drink water and eat something.
When I was a kid and my parents built a sauna to our summer cottage, I spent two hours straight in the sauna, but that is pretty hardcore even on my standards. As long as you as you keep yourself hydrated, there is no real time limit how long you can be in a sauna. A normal sauna session usually consists of several short 5-20 minute sessions (depending on the amount of löyly thrown and the temperature of the sauna) where you go cool off in between.
Yes, portable sauna's are definitely possible. You can purchase a sauna kit and follow the set-up instructions. As long as proper ventilation is installed, there will be no problems.
You should see results after your first cleaning treatment.
35 mins of cardio a day for a year with a 2000 calorie a day diet, you should loose 40-70 lbs
You can burn between 300-600 in about 30 minutes.
REALLY long time ago in Finland
Anything between a few minutes to hours. Benefits: Sweating, detox and skin purification.