The Time Worked field currently uses 5 decimal points to accommodate customers tracking seconds. However, you can create a new custom formula field that calculates the Time Worked with 2 decimal points.

Here is the Formula: 

(floor((dftlytime__End_Timestamp__c- dftlytime__Start_Timestamp__c)*24))
+
(((dftlytime__End_Timestamp__c - dftlytime__Start_Timestamp__c)*24)-floor((dftlytime__End_Timestamp__c - dftlytime__Start_Timestamp__c)*24))