Customers payment taking a very long time to be deposited in to my account why is it taking so long ?

Deposit speeds depend on the product you're using and the type of payment, @Bit Moe. 
 

Standard deposits are processed every day except for Sundays, Thanksgiving Day, and Christmas Day. On the other hand, we deposit your funds within five business days for your first set of payments as the system sets up your account.
 

Once your account is fully established, future payments from your customers will be processed faster. You can check your current deposit speed by navigating to the Payments tab, as follows:

1. Navigate to the Gear icon, then Account and settings. 

2. Click the Payments tab. 

3. Review the Deposit Speed section. 

For more details about customer payment deposits, please check out this article: Find out when QuickBooks Payments deposits customer payments. 
 

You can also request an instant deposit to your bank account in less than 30 minutes by following the steps in this article: Get instant deposits in QuickBooks Online.
 

Please let us know if you have further questions about tracing your deposits in QuickBooks, and we’ll be happy to assist.