In Apama query definitions, time literals can be in within clauses.

A space is required between a float or integer literal and its associated time unit. A space is required between a time unit and a float or integer literal that follows it. Additional whitespace is also allowed.

You cannot specify a negative number.

Outside a query, you can use these keywords as identifiers. Inside a query, you cannot use these keywords as identifiers unless you prefix them with a hash symbol (#). See Escaping keywords to use them as identifiers.