Production-Wise: Acting = 4/10, Script = 3/10, Production = 7/10, Not a complicated job. Any organised director could rap it up in 21 days or less. So rent a working theater complex, bring in the gear, set up, shoot, tear down = 5-7 days. Editing another 5 days, 7 days if audio dubs are necessary and they probably are for the concrete corridor scenes. Render the print and save will probably ...