Taylor ,
Toad and Query Analyser are database management tools that allow you to open and modify the actual SQL code used to generate the stored porceedures and views that generate the tables and data sets that crystal reports uses to show the results in the form that you need.
BUT..... if you are not famililar with them, I would not recommend experimenting with thier use in that you could possibly do more harm than good.
You can also access the Tables though the Crystal database expert. The basic concept is that somewhere in your database, there is a table that hold the workcenter start times along with the work center number and most likely the code for the employee / operator that triggered it. You need to identify that table(s) and the related fields and then add thoose tables to the report to retieve the appropriate data.
There may also be a "Data Dictonary" available to you to help show where what information is stored. ( but some information is also always calculated instead of stored. ie in your case start and stop times will be stored but running time calculated. ) Look through your documation. everyones setup is slightly different in the way tables were named but the concepts are always the same.