How long will a personality be relevant for in a role?

After 3 -5 years, a successfully executed business plan will transform the business into an incredibly different operation: 

more/less employees, 
new location 
New markets
multiples rounds of investment, 
Increased Revenues 
established or new products  

With any of these changes, a company will likely need to shuffle personnel, to re optimize personalities and skill sets to take the company to the next level.

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