As I understand it, it would not be the same request, but similar requests.
EG:
- 2pm : Ad budget has $0.10 left, typical bid is 5 cents
- 2pm + 5 ms : Box 3 gets a request to bid on
an ad slot at foo.com
- 2pm + 6 ms : Box 8 gets a request to bid on an ad slot at bar.com
- 2pm + 7 ms : Box 13 gets a request to bid on an ad slot at baz.com
- ...
- 2pm + 750 ms : Box 3's bid wins - Budget = $0.05
- 2pm + 751 ms : Box 8's bid wins - Budget = $0.00
- 2pm + 752 ms : Box 13's bid wins - Budget = -$0.05
- ...