I have been using since they launched. Money always comes back to me. Affin Hwang will drop you a receipt every time you buy or sell. So it is safe.

1-2 biz days from deposit if before cutoff time of 2:30pm, 2-3 biz days if after cutoff time.

You may check their Help Centre > Deposit & Withdrawal >How long does it take for deposit to show in available balance.

I would recommend you read their Help Center articles if you're new to Versa and money market funds. They explain a lot of how it works there.

just parking short term only, waiting to attack SSPNi in Mac 22

is there any 'best time' to withdraw some of the money while not affecting much on the interest?

I think basically withdraw on weekday before their 2.30pm then you get your money the fastest. If you withdraw before non-working day then delayed and you dont get that missing interest