Think months, not weeks; mead takes time. You'll only need one 5g packet of 71B, it's enough to handle 5 gallons. I'd hit the fruit with campden tabs before yeast pitch & again when you rack onto fruit in tertiary. I found out the hard way (with plums) that freezing doesn't kill everything. I'd leave it on the fruit in tertiary for a month or 2. Regards, GF.