但是互聯網速度並不總是一致的，因此實際上，下載的時間可能需要30分鐘到

但是互聯網速度並不總是一致的，因此實際上，下載的時間可能需要30分鐘到幾個小時。

Results (English) 1:

But the Internet speed is not always consistent, so in fact, the download time may take 30 minutes to several hours.

Results (English) 2:

But Internet speeds aren't always consistent, so in practice, download times can take 30 minutes to several hours.

Results (English) 3:

But the speed of the Internet is not always consistent, so in fact, the download time may take 30 minutes to a few hours.