गमनमात्रसाध्यत्वाद् ह्रस्वकालह् ॥ कZ_०९.४.१६ ॥
gamanamātrasādhyatvād hrasvakālaḥ
Because it is achievable by mere movement (i.e., simply going/approaching), it requires a short time.
Execution time: an option that needs only straightforward deployment/approach is preferred when speed is strategically valuable.