TH,
I think you're getting a bit confused. There's a transient maximum of 109%N2 power on and 115% power off.
Nr limits are:
Power Off -
Maximum 115% Nr
Minimum 91% Nr
Transient Maximum 121% Nr
Transient Minimum 74% Nr
Transient Minimum 68% Nr (at touchdown when executing an autorotative landing)
Power On
Maximum 108% Nr (except transient maximum 109% Nr for 20 seconds)
Minimum 106% Nr for twin engine operations
Minimum 100% Nr for single engine operations
Transient 91% Nr
Transient 68% Nr at touchdown while executing a single engine landing
One engine operation up to Vbroc 100 - 108% Nr
One engine operation above Vbroc 106 - 108% Nr
Even if you were referring to Nr, you'd be unlikely to exceed the 109% transient limit of 20 seconds in a quickstop
Hope that helps.