Our softlines scan day takes a full 8 hr shift. Only one person does it. The only time we ever passed it off was when there was a system crash and we had to start all over close to that person having to get off for the day. (Um, that person is me.) I start the scan at 4am. This allows for the wifi not to be bogged down by guest phones for the first four hours (if the wifi is up and working well). It also allows for a hand off to another TM should there be any sort of system failure that causes us to have to restart and hand off. Scan is due by 5pm for us PST. So far I've only had to hand off once.
I usually turn in the softlines scan somewhere between 11:30am and 12:30pm depending on how well it's going. I am required to check in with ETL-LOG if he's in the building before turning scan in. If he is not in the building, I check in with the LOD of that shift. I do not make the decision to turn in the scan on my own. Once I get the okay, I turn in the scan as close to our store servers as I can. (Probably not necessary but I still have a residual bit of paranoia from this process).
Hardlines scan day usually takes four hours or close to five hours for me. About half a shift. Same process. I have to get permission to turn in the scan and I usually do right before 9am if there aren't any issues (again, starting scan at 4am).
Lately we've been turning in the score somewhere around 95 and 96%. Our softlines scan continuously (so far) comes back at 98%/green while our Domestics hits a high 97% for yellow but when they average our scores they give us a mid 98% over all which makes us green. We're doing well for the moment compared to the district and group so my STL is happy.