Use a 
DateFormatter<https://developers.google.com/chart/interactive/docs/reference#dateformatter>
:

// format column 0 of DataTable "data"
var formatter = new google.visualization.DateFormat({pattern: 'HH:mm:ss'});
formatter.format(data, 0);

On Tuesday, November 12, 2013 9:38:53 AM UTC-5, Sandeep Ambekar wrote:
>
> asgallant,
>
> With this, the pop up shows date as 31 Dec 1899 along with time.. how to 
> limit the pop up to just show time.
>
> thanks in advance..
>
> On Thursday, 4 October 2012 03:49:34 UTC+5:30, asgallant wrote:
>>
>> Change your data type to "datetime" and enter the data as date objects. 
>>  You can then set the vAxis.format option to "HH:mm:ss" to format the data 
>> as you want.  See an example here: http://jsfiddle.net/asgallant/UrBLG/
>>
>> On Wednesday, October 3, 2012 5:05:23 PM UTC-4, Arthur Shvetsov wrote:
>>>
>>> Hello everyone!
>>>
>>> I need to show time on vAxis in column chart. For example:
>>>
>>> 00:50:00
>>> 00:40:00
>>> 00:30:00
>>> 00:20:00
>>> 00:10:00
>>> 00:00:00-----------------------------------------------------
>>>                   User 1      User 2      User 3
>>>
>>> What is the best solution to my issue? I can build diagramm using 
>>> seconds, but how show formatted string 'hh:mm:ss' insted of seconds 
>>> (dataType: number) in vertical axes
>>>
>>> Thanks
>>>
>>

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