I'm rarely, if ever, in "just pay up" mode.
If he is "the one" that Conte wants, yeah, try your best to get him.
My impression is that he's a good player, possibly very good, and the release clause or thereabouts is probably somewhat decent value. Good age, should be a good fit for the system.
He's not extremely expensive even for a wing/full back. Not a Hakimi level fee, but also not a Hakimi level player.
I would be surprised if he's "the one" though. I think most likely Paratici has more than one name on the list and we're looking at deals plural to see what is possible. I don't think he's a "the one" level player.
If Sporting are sticking to the release clause as their overall fee there still may be a lot of negotiation to be done. Who knows if we can afford the release clause as a one off payment the way I think these clauses work?
Most likely that's the overall fee they're asking for. Which installments, can a deal be done with the sell on clause for Edwards etc.
For those reasons I think this will "drag on".