I believe hanging out with your extraverted/introverted counterpart will greatly reduce your development time, SFJ STJ SFP STP NFP NTP NTJ NFJ, im an INTP so hanging out with opposite ESFJ would be too much to soon, My Ti vs their Fe would always be in conflict, but hanging out with ENTP would play more to my Ne i would play to their Ti, also they would help me confront my Fe in a milder less constant way, I would help them confront their Si in milder less constant way, they could teach me to use Fe in a tertiary(realistic) way and I would teach to use Si in tertiary way, same with rest INTJ uses Se in a tertiary way like ENTJ, ESTP learns to use Ni in a tertiary way like ISTP ETC