Shares (reposts) of your Instagram post by accounts from the United Kingdom. A share means another account passes your post on, so the order is placed on the publication itself and not on the profile. One order serves one post: in the link field give the address of that post, not of your page and not of a story. If several posts need to be distributed, each one requires its own separate order.
The United Kingdom is an English-speaking part of Europe, so this position fits accounts that publish in English and are aimed at a European reader. If your content comes out in another language the shares will still be counted, but they will mean less to that audience — worth weighing before you place the order.
There is no guarantee on this position. Shares that disappear over time are not restored and not compensated: no free re-delivery of the volume is provided, and no money is returned for such losses. If you need a result that holds steady for months, this position does not provide it — better to say so upfront.
At the stated pace the maximum volume of 100 000 shares takes from 2 days to complete. That is a minimum reference point rather than a commitment: actual delivery may run longer. Smaller volumes finish sooner, in proportion to the stated speed.