correct number of instruction cycles and time? ASM PIC F18

correct number of instruction cycles and time? ASM PIC F18

Can someone please just check if my answer is correct? :)
The question is:
How long will it take for the following subroutine to execute if we use a
12 MHz crystal frequency on a F18 PIC?
movlw .20
movwf n
again:
decf n,f
bnz again
nop
nop
rlncf n,w
movwf PORTC
nop
return
My answer is:
22.66 ns which is about 23 ns.
We have 68 instruction cycles, right? And then one cycle will take .33333
ns??