I'm not sure. Where do you see such wide fluctuations as five minutes and two days. The only place I see something like that is when uploading, not downloading, to Dropbox. What happens when you use other browsers? Perhaps the download is timing out because of a network problem. it may be so slow for so long that it simply stops as a timeout. You may be able to verify that by checking the download history, which I'll discuss later if necessary. But first, what happens with other browsers?
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so what happens
when it works, the download will complete successfully
when it does not work, i normally hear 5 minutes remaining or then it goes to 2 days remainding then 10 minutes
then it does not work