Files can be downloaded using a broadband connection at a rate of $40\backslash$times $106$

bits per second $(40$ Mbps

$).$ Using a fiber$-$optic cable, the download speed increases to $2\mathrm{.}0$ Gbps

$.$ The Library of Congress digital collection totals about $74$ TB

$.$ How long does it take to download these files using a broadband connection?

Express your answer to three significant figures and include the appropriate units.