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It's just very time consuming to get such a large quantity of data.

要收集这么多的数据就是非常耗时。

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The quantity of data likely to be produced is anybody's guess.

对于任何人来说，可能产生的数据总量都还是个未知数。

youdao

Most of us appreciate this new ease in exploring the vast quantity of data on the Internet (and the vast quantity of activity generated by our friends).

FORBES: How Flickr Has Made It Easier To Out Pervs

And the quantity of such data has exploded: more than 80% of a typical company's information is now unstructured, according to some estimates.

ECONOMIST: Software in the recession

Forty computer programmers from Facebook, Google and Amazon and Citizen Science Alliance are spending the next three days brainstorming in London trying to devise a game that we can all download as an app that will mean whilst we "play" we are also analysing the vast quantity of gene data that is out there.

BBC: Can an app help find cancer cure?