Of corse it's possible, you have just to do it.
It's not easy at the begining (no tv, web..) but it's ok after some time. I spent some time like that with one meal, early wake up, no tv, no web, no phone etc (but continuing to work) and it's was one of the bestest time of my life. Now i'am trying to return at such routine.
The danger in urban-monk-lay-routine is other peoples who will bring tentations, distabilisation, etc. (actualy i broke this mode because of external peoples, so it is realy important to be secluded from everybody, or make some distance with them to avoid all unsuitable contacts). So if you are realy alone, realy secluded, it's possible to keep it rooling on until Nibbana
My urban-monk-lay-routine was:
3.00 pm - wake up + shower + meditation
4.00 pm - puja + meal
5.00 pm - sutta reading
6.00 pm - work
2.00 am - meditation
3.00 am - sutta reading + dhamma talk
4.00 am - meditation
5.00 am - sutta reading
6.00 am - meditation
7.00 am - dhamma talk
8.00 am - meditation
9.00 am - sleeping
3.00 am wake up + shower + meditation
Of corse it's no so regid and you can sweetch hours, make somethink less, somethik more etc.