We started at 4 months with #1 and at 6 months with #2 ( due to moving and computer problems
)
They both love reading and loved LR lessons, there is a lot of variety, and lessons are upbeat and short -- they are designed for very young learners.
Sessions were a few minutes each, as my girl grew she would always ask for extra lessons, so I would download some additional files in English, Russian or Mandarin from the library on the topics that she liked, and would do a few of those. You can check the library with free extra lessons here:
http://forum.brillkids.com/downloads/?cat=63 -- English lessons
http://forum.brillkids.com/downloads/?cat=64 - Foreign languages ( 20+ different languages!)
Hope it helps. Please do ask if you have any other questions!