28
visitDuration>=0;visitDuration<=10
0
visitDuration>=11;visitDuration<=30
1
visitDuration>=31;visitDuration<=60
2
visitDuration>=60;visitDuration<=120
2
visitDuration>=120;visitDuration<=240
0
visitDuration>=240;visitDuration<=420
0
visitDuration>=420;visitDuration<=600
0
visitDuration>=600;visitDuration<=900
1
visitDuration>=900;visitDuration<=1800
0
visitDuration>=1801