应该是电脑的配置不够吧

This part of the syntax:

/METHOD=EXACT TIMER(5).

tells SPSS to try to calculate for 5 minutes before quitting. You can increase that number for SPSS to try longer. However, if you keep increasing it and it still doesn't finish, it can be very time consuming to keep trying, so it might be a better idea to switch your method to Monte Carlo because it has a 99% confidence interval and it's not likely to be off by that much. In the end, you have to decide whether or not it's worth the time to get the exact value