Some divisions even after 5-6 years no promotion. Depends on division and their management. Because some divisions the KPI is not made known to the staff, only those who are close to their supervisors, managers or are really talented in their work will get noticed and get promoted fast.

Most of the time is promote through wayang. Honest hardworking can't get you far unless the staff sell their souls and really do all their biddings.

Imagine this:

Staff A, hardworking and talented, E5 to E6 in 5 years, E6 to M1 in almost 3 years.

Staff B, used staff A method to his work, claimed as his own, close to PM and wayang king, converted and promoted to E6 in less than 3 years.

If the division has many staff like staff B, good luck waiting for promotion.