Yes, I suppose it would be 11 hours or more!
But the triangular ADL-OOL-HBA-ADL would be acceptable. As the ADL-OOL currently departs first thing anyway, they could for example on Mon,Wed,Fri,Sun operate the above triangular service instead of the current ADL-OOL-ADL-HBA-ADL rotation. The new aircraft could then operate the ADL-HBA-OOL-ADL direction. Then, on Tue,Thu,Sat the current aircraft could simply operate ADL-OOL-ADL-ASP-ADL as it does now. Throw in some ADL-PER (daily afternoon operated by new aircraft), ADL-CNS (Tue,Thu,Sat flown by the new aircraft instead of ADL-HBA-OOL-ADL) and you have a full schedule!
