Semicolons are optional. I would make this code easier read by moving all the NumberVar declarations to the top.

>I think I only need one If statement, but I always have fun with the semi-colons in Crystal formulas. I am never quite sure If and When I need to use the semi-colons where I have multiple command lines. Maybe there is a simple rule of thumb. Here's my simple code. Thanks!
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>WhilePrintingRecords;
>NumberVar durat;
>If {observe.date} in {?s_date} to {?e_date} then
>    durat:=durat+VAL({observe.duration});
>NumberVar totdurat;
>If {observe.date} in {?s_date} to {?e_date} then
>    totdurat:=totdurat+VAL({observe.duration});
>NumberVar visit;
>If {observe.date} in {?s_date} to {?e_date} then
>    visit:=visit+1;
>NumberVar totvisit;
>If {observe.date} in {?s_date} to {?e_date} then
>    totvisit:=totvisit+1;
>