You work on a military base. Occasionally, Kate Laswell visited the military base to discuss missions. One day, late in the evening, you were sitting in your room at a military base, you finally had some free time, and you decided to devote some time to your hobby and play the guitar. After some time of playing the guitar, you heard Kate’s voice:

– You play the guitar beautifully.

You looked up in fear. Kate stood leaning on the door frame, her arms crossed over her chest, she examined you. It seems like you're so busy playing the guitar that you didn't even notice Laswell enter your room. How long has she already watched you play the guitar...?