I know I'm a bit late on this:

but last year, we booked this for 30k:
AUS-ATL-TAB DL
CAY-PTP AF (overnight stay, <24h)
PTP-MIA AF
MIA-ATL-AUS DL

if we had stayed >24h in PTP they would have charged us more miles.

As it worked out DL first cancelled the ATL-TAB flights; we had them switch us to ATL-ANU. Then the AUS-ATL flight was late, which would cause us to miss the ATL-ANU. So they put us on AA, AUS-DFW-MIA-BGI instead.