You can maintain simple metamorphoses much longer.
Prerequisite: The ability to manifest a power with metamorphosis in the name or cast a polymorph spell with a range of personal.
Benefit: When you manifest minor metamorphosis the duration becomes 1 hour / level. When you manifest metamorphosis or major metamorphosis the duration becomes 10 min. / level. When you cast a polymorph spell with a range of personal of 3rd level or lower its duration becomes 1 hour / level. Any other polymorph spell with a range of personal that you cast improves its duration by one category; from 1 round / level to 1 min. / level, for example.
Special: If you have a manifester level, this feat is a Psionic feat.