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
user post2364 Looks OK 14 mins ago
user post2718 Looks OK 14 mins ago
user post2362 Looks OK 14 mins ago
user post2455 Looks OK 14 mins ago
user post2354 Looks OK 14 mins ago
user post2487 Looks OK 14 mins ago
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.
Edit: If you don't have 10k tools, but you suspect a user formof robo-reviewing, you can do the same when going to the reviews tab on that users userpage and subtracting the time on two consecutive reviews. Again, this only works with consecutive reviews, but a robo-reviewer will likely do more than one review.