Very good examples of phrases like

• ‘If you’d like me to do that for you, I charge $XXX/hour.’
• ‘I can spend ten minutes with you, and if you require more assistance I will be glad to schedule a consultation at my regular rates.’
• ‘You do know that we just crossed into paid time?’ he asked. ‘Oh, yes,’ the prospect said

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http://freelanceswitch.com/freelancing-essentials/turn-free-advice-into-clients/