3567 – Lengthening Prayer Versus Hearing Kedushah – הארכת תפלה לעומת שמיעת קדושה

The Rebbe addresses whether one should shorten their prayer to hear Kedushah or continue their usual lengthy prayer. He explains that since intention is the main aspect of prayer, one should not shorten their meditation even to hear Kedushah, as supported by the tzt"z's ruling. https://www.torahrecordings.com/rebbe/igroskodesh/011/009/3567