How long can I exercise to burn fat?

I know that in order to burn fat, you must exercise at least 20 min (with your pulse within a certain range) or it does no good at all, but is there a top limit? Is there a number of min that you no longer gain any benefit? Do you stop getting any benefit after 35 min? After 40 min? Also, how long should you wait inbetween exercise sessions? 1 hr, 3 hr, more?

well really the longer u run the more calories u burn , there is no ceiling

but theres exhaustion and dehydration, so u shouldnt and really cant just keep running

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