Hi vinay4444, I believe something like this will work, referencing the documentation on case : http://docs.splunk.com/Documentation/Splunk/6.2.4/SearchReference/CommonEvalFunctions#Comparison_and_Conditional_functions
index=XXX sourcetype="XXX" itemKey ="$metric$" name = "$Host$" | timechart [ eval spantime="span=".case(itemKey=="x",10,itemKey=="y",1)."m" | return $spantime ] $statistic$(value) by name
Guessing you are spanning in minutes, so concatenated an m to the end, but you could modify that or build it into the case statement.
Let me know how this works!
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