1) You must have documents stating your Hours, which is equivalent to Full time working hours. Your Payslip is the best supporting document
2) Every year you have 4 weeks of Annual leave so 8 weeks are good, But if you were out of Country for Work related the you can claoim more than that as well. In my case i was 8 weeks on my annual leave and 4 weeks for work related. IMMI considered all and granted 887.
3) Even after completing your 2 yrs, you must be in designated area only as per your 489 visa. Infact, untill your 489 is valid. You will get bridging visa immediately but it will come in effect once 489 expire.
Thanks