Which dre number maximum to warm up, and which dre number to keep constant at warm operation

Moin, wanted to know how high you turn your ktm smc690 with cold engine, how many kilometers you need to warm up, and what number of your constant drive on longer distance. my engine turns yes to 8 thousand, can I drive with warm engine constant with 4000-4500 dre number? or is that too high ?? or can you still ride higher zb 5,000 with warm engine since she has always good train. please explain my questions thank you =)