The AMAT $62.50C is at its high of the day at $4.80 (+55%). AMAT reports earnings today after the bell so if you are intending to exit before earnings, taking 50% (or close to it) for a two-day trade sounds about right. If you're staying in through earnings be aware that if you guess wrong the stock can gap right through your stop at tomorrow's open. If you guess right, another triple digit gain. Selling half here could get you the best of both worlds.