How Long To Go Do You Think?

Hi guys, im new to the forum but ive been lurking a few weeks. We got some guppys a few weeks ago, 4 females and 2 males. Two have been quite fat with the dark gravid spot i think. One has now gone quite slim so i think we missed the fry during the day. Today i went to get a breeding box and managed to put the guppy in without any problems. From the pic can you see how far along she might be - i dont want to keep her in the box for too long on her own.

Different angle.

They drop when they drop be patient, and I'd say a week?

When she squares off she's ready, I'll guess a week also

Thanks for the prompt replys. She does look quite 'boxy' at the back but doesn't show in the pics. Would it be best to release her and pop her back in later?