For European options on a stock, Given:

• The stock price is 43.

• The continuous dividend rate of the stock is 0.02.

• The strike price for each option is 46.

• The continuously compounded risk-free interest rate is 0.04.

• The price of a call option on the stock is 2.

• The price of a put option with the same time to expiry as the call option is 2.30.

  Determine the time to expiry for these options.