How do others handle this issue?

New customer walks in door and you do some work for them. In order to handle, the steps are:

1. Enter new customer information

2. Log time against customer.

3. Log any expenses or supplies against customer

4. Invoice

There are times I may want to do this all at one sitting. But...

A. When I enter the new customer into the system, it may take as much as 15 minutes or longer for the new customer to show up so I can log time against the new customer, to input expenses, etc.

B. When I finally get the customer accepted, or even if it was an existing customer, and I log time, it may take another 15 minutes or longer for an invoice to reflect the new charges against the customer. If I have a long string of charges, time & expenses, and I don't check carefully, I may miss that the latest line items haven't hit the invoice yet. 

Right now, I have been waiting 15 minutes for the items to update so I can invoice my client. A(nother) total waste of my time because of a Quickbooks quirk.  

Quickbooks tells me the various databases are on different locations, and they are not real time. That was a problem I never encountered with my 2014 Desktop that worked so much better than the Online version.

How do others handle this?