Calculation with timestamp() in siebel query language

Hi fellow experts,

So I need to run this query:

field "Created" is in the last 2 hours

I need this query in 2 different places:

1. A Search Specification expression for a Workflow Process Batch Manager server job
2. a query expression for end user in the Siebel GUI

I'm actually struggling with the syntax.

in the GUI, I can't get the minus 2 hours working.

I'm stuck here and it doesn't work:

(GUI) Created >= (TimeStamp() - ((1/24) * (2)))

siebel throw an error about grammar rule / unexpected token.   

Any thoughts?

Cheers,

Matthieu