2 week cruise in Neptune (2guests), we tip 20.00 to each Neptune concierge, if we've been to Neptune Lounge a few times and not had them assist us with reservations, etc. If we've asked them to help with issues, reservations, etc, we'll tip more. One year, 75.00 to each, but they did a ton for us. We usually tip around 100.00 a week to each room streward for 2 weeks, so 200.00 for each.