Hi Lisa,
I am a relative newcomer to this site, and I hope that this does not mean that my comments do not count.
I think that your confusion is in the actual amount of time that a customer wants you at the property v how long the clean will actually take.
For example, my company cleans a large amount of holiday homes. For the average size property we know from experience that it will take approx 2 hours.
We use teams of four, thus meaning that we only spend 1/2 hour in the property, but we charge the customer 2 hours.
Putting this theory to your new client, if you had 2 cleaners in the property for 1 1/2 hours each, they would still complete 3 hours work, therefore you would only need to charge you client the same, 3 hours.
This is just my own opinion but I never ever quote a cleaning job over the telephone. I will have a general discussion about hours wanted, time, regularity etc, but that's it. The rest is face to face. This gives me the opportunity to look at the job, i.e how clean the property is (or not as the case maybe) and be honest with the customer.
For example, I have just about to turn a potential customer away, as her five bed property was absolutely filthy, she wanted us to come in for two hours a fortnight. This was not even going to scratch the surface. I explained this to her, and the fact that I would not be happy leaving the property not to our standard. she was o.k with this, and appreciated my honesty. We have now succesfully tendered a thorough one off clean, and are now more than happy to continue regular cleans.
I hope this helps, and sorry if I have confused you even more
Kind regards
Paul