Jeff Milrad asks:
how many hours do they consider a day for her to work? can she start at 10 5 minutes before and call that amount of work a prutah?
The Kollel replies:
Dear Jeff,
If on the last day of her being a slave there remains work-time that has a value of at least a Perutah (it could be even 5 minutes or less) then redemtion of Gira'on is still possible.
All the best,
Reuven Weiner