I am once again working on my multiplication table test. My problem now is giving the user a time limit to input an answer. Please consider this code:

     18 #time limit per question
     19 my $limit = 10;
     20 
     21 #define main window
     22 my $mw = MainWindow->new;
     23 
     24 #create a large readable font
     25 my $font = $mw->fontCreate('font',
     26     -family => 'courier',
     27     -size => 28,
     28     -weight => 'bold');
     29 
     30 $mw->title("Times Tables");
     31 
     32 #return key prints question without
     33 #calculation the first score
     34 $mw->bind("<KP_Enter>", \&question);
     35 
     36 #scale to select upper limit (up to 12)
     37 $mw->Scale(-from => 1,
     38            -to => 12,
     39            -variable => \$scale)->pack(-side => 'left');
     40 
     41 #guess widget
     42 $mw->Entry(-width => 3,
     43            -takefocus => 1,
     44            -font => $font,
     45            -textvariable => \$guess)->pack(-side => 'right');
     46 
     47 #question widget
     48 $mw->Label(-textvariable => \$question,
     49            -font => $font)->pack(-side => 'right');
     50 
     51 #right/wrong widget
     52 my $rw = $mw->Label(-textvariable => \$rightwrong,
     53            -foreground => $colour)->pack(-side=> 'bottom');
     54 
     55 #score widget
     56 $mw->Label(-textvariable => \$score)->pack(-side => 'right');
     57 
     58 #timer for answer
     59 if ($count >= 1){
     60     $timer = $mw->repeat($limit, \&check);
     61 }
     62 
     63 
     64 MainLoop;
     65 
     66 #checking
     67 sub check {
     68     if ($count >= 1){
     69         $timer->cancel();
     70     }
     71     
     72     if ($answer == $guess) {
     73         #count correct answers
     74         $correct++; 
     75         $rightwrong = 'Correct!';
     76         $colour = 'dark green';
     77     }else{
     78         $rightwrong = "Wrong! $num1 x $num2 = $answer";
     79         $colour = 'red';
     80     }
     81     $rw->configure(foreground => $colour);
     82 
     83     #count questions
     84     $count++;
     85 
     86     #calculate score
     87     $percent = int($correct/$count*100);
     88     $score = "$correct correct out of $count\n($percent%)";
     89 
     90     #clear guess
     91     $guess = "";
     92 
     93     question();
     94 }
     95 
     96 
     97 sub question {
     98     #generate question and answer
     99     $table = $scale;
    100     $num1 = int(rand($table)+1);
    101     $num2 = int(rand(12)+1);
    102     $answer = $num1*$num2;
    103     $question = "$num1 x $num2 = ";
    104 
    105     #return checks answer and prints
    106     #new question.  This prevents
    107     #the first loop from calculating
    108     #a score
    109     $mw->bind("<KP_Enter>", \&check);
    110 }
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How can I have the program check the answer automatically after 10 seconds regardless of user input?

Neil Watson
watson-wilson.ca