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This question might be considered a duplicate. It is closely related to these:

• Considerations when determining efficiency of Mathematica code
• Difference between AbsoluteTiming and Timing
• Benchmarking expressions
• Profiling from Mathematica

However, one simple reading of this question that I do not believe is covered in the answers above is answered with this Front End option:

SetOptions[$FrontEndSession, EvaluationCompletionAction -> "ShowTiming"] 

This will print the total evaluation time for each cell as it completes in the lower left window margin:

To make the setting persistent between sessions use $FrontEnd in place of $FrontEndSession.

Update: "ShowTiming" was already covered in Brett's answer to:

• Does AbsoluteTiming slow the evaluation time?

This question might be considered a duplicate. It is closely related to these:

• Considerations when determining efficiency of Mathematica code
• Difference between AbsoluteTiming and Timing
• Benchmarking expressions
• Profiling from Mathematica

However, one simple reading of this question that I do not believe is covered in the answers above is answered with this Front End option:

SetOptions[$FrontEndSession, EvaluationCompletionAction -> "ShowTiming"] 

This will print the total evaluation time for each cell as it completes in the lower left window margin:

To make the setting persistent between sessions use $FrontEnd in place of $FrontEndSession.

Update: "ShowTiming" was already covered in Brett's answer to:

• Does AbsoluteTiming slow the evaluation time?

This question might be considered a duplicate. It is closely related to these:

• Considerations when determining efficiency of Mathematica code
• Difference between AbsoluteTiming and Timing
• Benchmarking expressions
• Profiling from Mathematica

However, one simple reading of this question that I do not believe is covered in the answers above is answered with this Front End option:

SetOptions[$FrontEndSession, EvaluationCompletionAction -> "ShowTiming"] 

This will print the total evaluation time for each cell as it completes in the lower left window margin:

To make the setting persistent between sessions use $FrontEnd in place of $FrontEndSession.

This question might be considered a duplicate. It is closely related to these:

• Considerations when determining efficiency of Mathematica code
• Difference between AbsoluteTiming and Timing
• Benchmarking expressions
• Profiling from Mathematica

However, one simple reading of this question that I do not believe is covered in the answers above is answered with this Front End option:

SetOptions[$FrontEndSession, EvaluationCompletionAction -> "ShowTiming"] 

This will print the total evaluation time for each cell as it completes in the lower left window margin:

To make the setting persistent between sessions use $FrontEnd in place of $FrontEndSession.

Update: "ShowTiming" was already covered in Brett's answer to:

• Does AbsoluteTiming slow the evaluation time?

This question might be considered a duplicate. It is closely related to these:

• Considerations when determining efficiency of Mathematica code
• Difference between AbsoluteTiming and Timing
• Benchmarking expressions

However, one simple reading of this question that I do not believe is covered in the answers above is answered with this Front End option:

SetOptions[$FrontEndSession, EvaluationCompletionAction -> "ShowTiming"] 

This will print the total evaluation time for each cell as it completes in the lower left window margin:

To make the setting persistent between sessions use $FrontEnd in place of $FrontEndSession.

This question might be considered a duplicate. It is closely related to these:

• Considerations when determining efficiency of Mathematica code
• Difference between AbsoluteTiming and Timing
• Benchmarking expressions
• Profiling from Mathematica

However, one simple reading of this question that I do not believe is covered in the answers above is answered with this Front End option:

SetOptions[$FrontEndSession, EvaluationCompletionAction -> "ShowTiming"] 

This will print the total evaluation time for each cell as it completes in the lower left window margin:

To make the setting persistent between sessions use $FrontEnd in place of $FrontEndSession.