مدة الرد على خطاب عرض العمل

There is no decided validity for the offer letter, It depends on the deal between you and him.

If it is not mentioned in the letter, it is as you will decide between you and him for the validity.

So If you didn't decide any validity date, it is valid until you send your response either with acceptance or rejection.

There is no time period or validity period for offer letter, it depends on you and your employer.

If the validity period is not mentioned in the offer letter, then the validity will be decided between you and your employer.

Until you didn't decide any validity date, it is valid until you send your approval to accept or reject the offer letter.