To Trim or not To Trim?

I have always had this question about triming my hair. Do I do the normal standard of every four weeks or spot trim. Well I have not trimed my hair in the past 5 months or so. My hair is doing pretty well. I do spot trim because I can not stand split ends. When I was pressing and straightening my hair I would have to trim, or cut my hair quit often because of all the heat damage!! That I no longer have to do.