Solve for the unknown number of years in each of the following: $($Do not round intermediate calculations and round your final answers to $2$ decimal places.$)$

$\backslash$table$[[$Present Value,Years,Interest Rate,Future Value$],[$$$,610,7\%,$$$1,439,],[860,10,1,871,],[,,,],[,,17,294,715],[,,15,435,258]]$