Not long enough?

Fun fact - sauna is the only word of Finnish origin commonly used in English.  The cabin we stayed in came equiped with a sauna so my friend and I decided to try it.  I was underwhelmed.  It was pleasant enough for a little while but after 15 minutes or so I was ready to get out.  I think I probably didn't stay in long enough.  We did follow the heating directions and poured the ladles of water over the hot rocks producing plenty of steam, and it was good to breathe humid air for a little while but I did not feel any compulsion to run outside and roll in the snow.  When we were in Helsinki earlier in the trip we were driven by a public sauna where three young ladies were standing outside in bathing suits ready to jump in the very cold lake.  The air temperature was about 32 degrees.  They obviously had steamed long enough to really want to cool down. Personally, I get more pleasure from a long hot shower.  As another friend on the trip said "It was an interesting experience but not worth remodeling the house to put in a sauna."