We started by offering once a day. DS wasn't very interested (and acutally gagged and threw up :LOL) so we backed off and tried again in a week or so. We offered once a day, and it wasn't until DS about 8 or 8.5 mo when he started eating much of anything.
BLS is all about following baby's lead. So watch your baby and his interest in solids and keep adding more solids feedings when LO is interested in more.
When DS was about 12 or 13 mo we were up to: breakfast, snack, lunch, snack, snack, dinner