The duration of the braids with extensions can significantly vary depending on the style of the braid, the length and thickness of the hair, and the experience of the person making the braid and the kind of extensions. Generally, here is an overview:

Braiding style:

Box Braids: This is one of the most common styles and can take anywhere from 4 to 8 hours. The time largely depends on the size of the braids. When the braids are small, it usually takes longer, up to 10 hours. 

Cornrows These can take between 2 to 6 hours, depending on the complexity of the design and the number of cornrows.

Micro Braids are very small and fine, hence they can take 8 to 12 hrs or even more.

Length And Thickness Of The Hair:

Shorter Hair: It generally takes less time because it has less amount of hair for braiding.

Longer Hair: It will take more time because the braider has a lot more hair to work with.

Thicker Hair: It can take more time due to the fact that it contains more quantity as well as weight. Experience of the Braider:

Experienced Braiders: They are much quicker as they are experienced and know what they are doing.

Less experienced braiders: They would take longer, as they would work slower and much more carefully.

Type of Extensions:

Synthetic Extensions: These are the normally used types. It may be quicker to install them.

Human Hair Extensions: They usually take a much longer time, as they require more delicate handling.

Additional Factors:

Preparation Time: Under which washing, drying, and detangling the hair before the process starts may take an hour or two more.

Breaks: Depending on the length of the procedure, both the client and the braider may need to take breaks.

In a nutshell, the length of time to braid hair with braiding hair extensions can range from a minimum of 2 hours for simple designs to over 12 hours of very detailed braiding. When detailed styles are requested, time should be scheduled accordingly, and a lengthy appointment should be expected.