Sentence 1: How long could it take?

Sentence 2: How long can it take?
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: However, case studies, like any other method GAO uses, have to meet two other criteria of accuracy and lack of bias, in the sense that the evaluator's personal, preconceived opinions about a situation do not distort reporting and that the evaluator is scrupulously evenhanded in examining all sides of a situation.

Sentence 2: There are two criteria relating to bias and accuracy that case studies have to meet.
Is this second sentence entailed by the first?

Answer: yes

Sentence 1: Even as there are relatively fewer workers to pay taxes to finance Social Security and Medicare, these programs will have to provide benefits over longer periods of time as life expectancies rise.

Sentence 2: The programs are beginning to have to pay less as life expectancies are beginning to fall.
Is this second sentence entailed by the first?

Answer:
no