Code:
bool showmessage=true;
ffc script messagecutscene
{
    void run(int s,int t)
    {
        while(true)
        {
              if (showmessage==true)
              {
                     Screen->Message(s);
                     Waitframes(t*60);
                     showmessage=false;
                     Quit();
              }
              else
              {
                    Quit();
              }
         }
   }
}
D0:the string you want to show
D1:the time in seconds you want it to be shown

I think it might work... I'm not even sure if you need a script for that anyway...