How much time should I wait between SIY and SIY Advanced Series?

There is no set time, but the SIY Advanced Series was designed for SIY alumni who have had a chance to explore integrating the practices into their life.  The program is not meant to be taken right after SIY.  If you do choose to take them together, some of the exercises in SIY Advanced Series might feel redundant or may not be applicable since they were designed for people have had a chance to explore applying the practices between SIY and the Advanced Series program.