How to limit post length on your homepage

I just need­ed to set this up for myself so why not write a brief tuto­r­i­al so I will remem­ber. I orig­i­nal­ly found this at here I am repeat­ing this infor­ma­tion since I often have to do the same thing on oth­er blogs for clients and such and to fur­ther explain some points I m
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