WotLK Diminishing returns and combat on WOTLK

[Pallyzx]

hello, got a question - what is DR / and combat timer on blackrock s5/s8?
is it 15-20s dynamic for DR and 5-6.5 dynamic for combat?
would be thankful for any links where it stated, couldn't find it by myself

[skullatbash]

ye, both dynamic:
15-20 DR
5-7 combat