Dahua DH-XVR5104HS-4KL-I3 User Manual page 317

Click
You can configure the resolution, frame rate, bit rate and record time for the selected channel.
Click OK to save the settings.
Then the system will calculate the time period that can be used for storage according to the
channels settings and HDD capacity.
Click Copy to to copy the settings to other channels.
Calculating Recording Time
On the Rec Estimate page, click the By Space tab.
Click Select.
Select the checkbox of the HDD that you want to calculate.
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Rec estimate
By space
User's Manual