haha you know lecturers need to take on additional task such as collaboration of project with industrial partner etc. Teaching is just their normal duty because if they keep teaching for many years without keeping themselves abreast of the new technology , they will be left behind.

1)some lecturers left after 2-3 years because they feel that they will lose their technical capabilities and skills if they stay in poly for too long..

2) some lecturers who want a slow pace and less stressful environment after working in the industry for many years. these group of people are usually in their 40s

3) another group of lecturers who are in their late 40s -50s won't leave poly because they simply know that they will not be hire after laze around for so many years. their capabilities are outdated.