The exporting speed depends on not only the size, length, and complexity of the project, but also the output settings. Meanwhile, it will be affected by the performance of your computer as well. There are things you can do to export more quickly.
1. Faster Hardware
In general, working with faster computers also means that your exporting will be faster. If available, be sure that your GPU is enabled in Filmora when exporting. You can click File>Preferences>Performance, then check the GPU acceleration there.
2. Optimized Media
It is suggested to cut down the unnecessary effects when editing the project. And when exporting, keep the Resolution, Frame Rate, and Bitrate the same as those in your original video to shorten the encoding process for scaling.