eidos
I already have a lot VacSy from Zepter products, since my mom wokred for them ages ago. Hopefully they are as good, or maybe even a bit better (i think they are pretty expensive).
However, you say only a few extra hours? So no chance of me doing the wheatgrass juice in the morning and drinking it ar work near lunch time (that's 6-8 hours after vaccuming).