Not if you want to win a 51% race. After claiming you took 2 wks + x, you’re going to solve the next 2016 blocks in 2 wks - x if you maintain your hashrate. If you don’t, you’re not going to win chain work. To claim it took 2 wks + x in that round, you have to add 2x to to your 2 wks - x real time. You have only 1 x to manipulate without penalty and the other x you have to add to real time. As those accumulate past 7200 seconds, no nodes will accept your blocks.