Depends on the condition of your hair and what you consider to be on a occassion and how strong your hair is.
My hair just broke off badly when I straightened and had bleach damaged (my top would be covered in inch long hairs). Now I am bleach free I heat straighten around once a month using lower heat, and heat protection. In between I am really looking after my hair with dt's and light oiling and its growing pretty good and in fairly good condition. I have to snip a few individual splits off almost daily but it doesn't effect my length at all.
Although I would like to go without trims - I know because I still heat style occassionally that regular teeny tiny trims are necessary. So that does slow my growth down a fair bit. Hope that helps.
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