Hold 24 hrs.
If for any reason you need/want the bitcoin to be held for a period of time before the buyer of the bitcoin gets it then it should be held by a trusted escrow until the 24 hour period is up.
Anyone that send paypal to you first is almost certainly going to never see any bitcoin from you.
If you are serious about selling your .05
BTC then I would be willing to sell my $15 worth of PayPal to you, however as I mentioned above am not sending first. If you do not trust me enough to send bitcoin to me first then I would be happy to use escrow (with the fee being on you)