السلام عليكم ورحمة الله وبركاته Ustadh, when drinking tee, i wait after some sips for about 2 minutes. Do i have to say the Tasmiyah again?

Ustadh AbdulAziz al-Haqqan

There isn't a specific time for that, however if u decide to stop drinking and then u went back and decided to drink again make tasmiyyah.