Most expect 5%-15% of charter price.
For most of the crew, when chartered, their day is about 16 hours long. The tip is to compensate the extra long days. If you had a crew of 12, paying them $200-$300 a day, that’s $2400/$3600 a day total, $16,800/$25,200 for a week
That’s fine, but it isn’t for a family on a budget.