It is common practice amongst the larger ATOs to ensure that the airline students complete on time iaw their contractual arrangements, otherwise what ever penalty clauses are specified are invoked.
As this would undoubtedly concentrates their minds, they will take all measures necessary to ensure that the airline students complete in a timely manner.
It follows therefore that whitetail aka self funding students will suck the hind tit as necessary, despite what any snake oil salesmen infer prior to signing on the line.
Your contracts will normally be heavy in favour of the ATO, probably with little comeback if through no fault of yours, the end date is delayed.
They will simply say ‘read your contract’. As ever CAVEAT EMPTOR