Diazed fuse heat dissipation
To solve that you need to calculate the power dissipated in the fuse (P = IR) and then the total thermal resistance between the fuse and the ambient. This would be then similar to a heatsink calculation and there are many examples of this on the web.
You are unlikely to find thermal resistance of a fuseholder published so your best bet would be to form an experiment:

Set up a fusebox and place the fuse in question into the holder.

Run an appropriate current through the fuse into a test load. This can be a low voltage setup such as car battery and lamps. Using low voltage would allow you to install a temperature sensor beside the fuse.

Run the test until the temperature stabilises.

Calculate the thermal resistance using formula:
$$ R_{Th} = \frac {\Delta T}{P} $$


where \$R_{Th}\$ is the thermal resistance of your fuse and holder, \$ \Delta T \$ is the difference in temperature between your fuse and ambient and P is the power dissipated in the fuse. The result will be in K/W (kelvin per watt).
You can then use this figure to predict temperature rise for any other current through that fuse.