Dear Sukhender Kumar,
If your staff has completed two day work in just a day and did not resume his duties on the second day then he is to be treated as absent. Call him and ask for explanation. If the explanation is not satisfactory, then issue the show cause notice. If the employee could not prove his presence then take disciplinary action.
When field duties are assigned, Manager estimates the time duration and allocates the work accordingly. If the work is finished early then employee must report to his/her duty station immediately. This is applicable even if the work finishes early on the same day.
The worst part is the employee has played truant. He left for home without keeping his manager informed. Therefore, he is liable for disciplinary action.
While initiating disciplinary action against the delinquent employee, you may handle the immediate problem at hand nevertheless, situation of this kind arose because of process flaw as well. In this age of mobile and internet, why your manager did not tell the employee to share the location on Google map? Through these modern means, you will be able to keep track of the employees working in the field.
Thanks,
Dinesh Divekar