[plt-scheme] r6rs timer

For myself I usually use #lang scheme (because it is so compete)
However, sometimes I am asked to provide R6RS conformant code.
Then I use #!r6rs (with an anoying long list of imports)
But I can't find something like PLT's "time" macro in any of the R6RS libraries.
Does something alike live in R5RS? If so I would be much obliged if you would provide me a pointer.
Thanks,
Jos
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