Handbrake's speed depends entirely on your settings. For example, in the video tab next to video encoder you can select codecs like H.264, H.265 or AV1. The newer the codec, the more efficient and space saving your result will be but also the more time it will take. You may or may not also see the same codec twice but with NVENC or some other hardware feature next to it. Those will be significantly faster. If you have a choice between multiple hardware acceleration options, I'd recommend picking Nvidia > Intel > AMD for the best results. If none appear, you could buy a newer graphics card that support those features if budget allows. Other than that, something else that also significant affects how fast Handbrake will be is the preset option in encoder option (also in the video tab). You can select everything from placebo to slow to fast to ultrafast. The slower the higher the quality but also the slower it will be. Faster presets will be faster but will offer lower quality.