I have 315 years in Egypt and 115 years in Cannan
The "short sojourn" is unbiblical rubbish.
430 years of families should equal a very large number, and it does.
Num 26:57
And these
are they that were numbered of the Levites after their families: of Gershon, the family of the Gershonites: of Kohath, the family of the Kohathites: of Merari, the family of the Merarites.
Num 26:58
These
are the families of the Levites: the family of the Libnites, the family of the Hebronites, the family of the Mahlites, the family of the Mushites, the family of the Korathites. And Kohath begat Amram.
Num 26:59
And the name of Amram's wife
was Jochebed, the daughter of Levi, whom
her mother bare to Levi in Egypt: and she bare unto Amram Aaron and Moses, and Miriam their sister.
Num 26:60
And unto Aaron was born Nadab, and Abihu, Eleazar, and Ithamar.
Num 26:61
And Nadab and Abihu died, when they offered strange fire before the LORD.
Num 26:62
And those that were numbered of them were twenty and three thousand, all males from a month old and upward: for they were not numbered among the children of Israel, because there was no inheritance given them among the children of Israel.
Num 26:63
These
are they that were numbered by Moses and Eleazar the priest, who numbered the children of Israel in the plains of Moab by Jordan
near Jericho.
Num 26:64
But among these there was not a man of them whom Moses and Aaron the priest numbered, when they numbered the children of Israel in the wilderness of Sinai.
Num 26:65
For the LORD had said of them, They shall surely die in the wilderness. And there was not left a man of them, save Caleb the son of Jephunneh, and Joshua the son of Nun.