SSIS Interview - What is the maximum length of expressions in SSIS 2008 and New versions of SSIS

SQL Server Integration Services(SSIS) Interview Question "What is the maximum length of expressions in SSIS 2008 and SSIS 2012?
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How to write expressions in SSIS Pacakge on Variable
How to build SQL Query dynamically in Execute SQL Task in SSIS Package

Complete list of SSIS Interview Questions by Tech Brothers