no where in the indian legal system mentioned about the time frame because the will be executed by the testator and he will keep it in the safe place and if possible he will disclose the facts to the person to whom he had written the will and the witness will be know the facts
in case if testator has hide the facts and kept it in a safe place wihout telling anyone about the will say after 10 years on fine day if we find the papers and say in your case also after some years you find the papers as will and file in the court for probate if any other person who is enjoying the rights obtained from the court challenges the genuiness of the will or the paper and finally court will decide about all the facts and give judgement if the will is genuine