Three words that I come across regularly are Recovery, Mitigation and Acceleration and they mean differnt thing to each party. Very often Employers complain that the Contractor is failing to Mitigate when what they really mean is that the Contractor is failing to Recover, or, more likely, failing to Accelerate.
A good definition of Mitigation is carrying out all necessary measures short of expending extra money. For Recovery, a contractor may decide to expend smaller sums than his obligation for probable damages. Acceleration generally requires an instruction and the Contractor is well advised not to accelerate without one.
If the contract contains capped provisions for Delay Liquidated Damages (DLD) then once the cap is reached the Contractor has no further obligations for Recovery or Acceleration. This usually puts the Employer in the position of choosing wheter to return some of the DLDs in exchange for Acceleration or accepting further delays. I hope this helps,