Hi!
I suspect you mean TestStep when writing TestCase!? (since a LoadTest can not run more than one TestCase at once)
A loadtest executes the underlying TestCase as configured; the contained TestSteps are run in the same order as if the TestCase would have been run "alone". There is no way currently to run the first Step for X secs and the second Step for Y secs, to achieve this you would have to create seperate TestCases and LoadTests for the two requests and then create a third TestCase with only a Groovy Script that would act as a "controller" and start the two LoadTests after eachother.
Hope that makes sense :-)
regards!
/Ole
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