How much time do you think will be dedicated to showing the nominations to the group? I'd say they should leave around 20 minutes for that and 40 minutes for the main show.

If half the main show is the housemates nominating that will make for a very dull show.

Will they show the nominations earlier to us or wait and reveal them at the end with the twist ?

Minus advert breaks, they'll have about 12 minutes.

It won't be live anyway, so they'll have edited down the "reveal" to fit the slot.

They might not even tack it onto the main show - it might be a BOTS exclusive.

Probably less than 12 minutes actually. They'll only be playing a quick soundbite from each person's nominations, so they should manage to fit it in. Having said that, they ran out of time when they did the face to face noms - cut off just as Dexter was about to stand up.