Yes, depends on your performance and headcount availability.

depends on your security clearance, 1-6 months

I got grade B, 3 months, is all grade B normally get same 3 months?

That is super long man. Months is crazy. Weeks still acceptable

there was a change so is the same now, no different for direct contract vs perm..

the contract actually pays better previously before the change.

Perm:
12mths
1mth AWS
up to 1 mth Corp Bonus
PB depending of grade... usually 1.2 - 2 for C, 2 - 3.5 for B

Direct Contract - previously
12mths
1mth anni bonus
0.5mth (1yr) or 1mth (2yr) contract completion bonus payable to end of contract
PB depending on grade... as written in contract 1.5 for C, 3.5 for B

you count yourself..

if you can't wait then too bad.. depending on the position, G50 will take months..

is quite a comfortable offer at Grade F for 5.8K, are you going with SVC group??

count yourself lucky.. they rarely take in Grade F position.. it might be due to your previous job salary or exp that HR don wanna give you Grade G, that's why have to offer u grade F.

anyways... Grade G usually starts around 5.8k if not wrong..

When you join a company you just want to get a contract role? Or you want to build up your career in the company?

Full time may be worst but seriously you get other perks such as medical etc, and most importantly you get career progression. Whereas as contract staff you want to every end of year re-negotiate for another year of contract?

Heard that 5.8k is bottom limit for Grade G, is this correct?

You convert from contract to perm recently?