If they are doing multiple reviews, then you can measure the time between those reviews. This assumes that you have 10k tools. Then you can see the review history of all users when clicking on reviews. If they aren't doing multiple reviews, then there is no big reason to suspect them of robo-reviewing. 

For example, I would find this suspicious:

> user 	post2334	Looks OK 	14 mins ago <br> user	post2364	Looks OK 	14 mins ago <br> user	post2718	Looks OK 	14 mins ago <br> user	post2362	Looks OK 	14 mins ago <br> user 	post2455	Looks OK 	14 mins ago <br> user 	post2354	Looks OK 	14 mins ago <br> user post2487	Looks OK 	14 mins ago <br> user post2682	Looks OK 	14 mins ago 

Also, if you hover over two consecutive `14 mins ago`, you can calculate the time between  the reviews. I suspect that that is where the users who post the comments get the time from.