Is the fact that the boss refuses to give the employee time off for Hajj regarded as an excuse that allows him to delay Hajj?

No File Exists
Check below answers in case you are looking for other related questions:
Obligation of performing Hajj straightaway
Ruling on someone who works in Hajj but does not do Hajj because he is unable to do it

No File Exists
Related Answers:
What constitutes being able to go for Hajj?
Should he do Hajj on behalf of a relative who cannot travel for Hajj?
Guidelines and rulings on Hajj al-badal (proxy Hajj)
Obligation of performing Hajj straightaway
Ruling on someone who works in Hajj but does not do Hajj because he is unable to do it

Recommended answers for you:
Why do Muslims say “Al-hamdu Lillah” after they sneeze?
Using the birth control pill and the coil
Reciting al-Faatihah during prayer
He committed zina with her and she got pregnant; can he marry her while she is pregnant or should she abort he foetus?
Praying at graves and the conditions of intercession