I had one about a month ago.
It took about 10 days for the money to appear back in my PayPal account. Apparently if it is stolen from a linked credit card PayPal transfer funds back onto the card but if it is from a linked bank account you have to transfer it back yourself.

I ended up ringing them and while "brad" in Texas was very lipservicy at least I knew they were dealing with it.

ETA - I just remembered that mine took longer because the offender pretended to refund the money first using a PayPal cheque so it was all on hold while they waited to see if that would bounce - so you should probably get yours back sooner.