Yes, it would vary with wet time/dwell time.   The mass transport of  block copolymer thin film on Si  and ITO coated  glass substrate by dip coating is a function of  wet time/dwell time, till uniform thickness forms.  

Thanks Habib Sir, As I know this is the time in which the molecules of solution  interacts with substrate So, on increasing the wet time thickness of film should increase upto some value. am I right? and according to that it will be different for different substrate though all the parameters are same. is it?

The increase of  the wet time would increase thickness of film in a linear manner until the thickness attains a steady state  value.   The slope of the linear thickness would be different for different substrates .   Likewise, the steady state value of the developed thin film would be different for different substrates, along with the all the parameters are invariants during the wet time duration.

Thanks Habib Sir for your reply

is there any formula/relation between thickness and wet time? what is the basic reason for increasing thickness with wet time? there is an equation named Landau and Levich equation to calculate thickness of film but there is no parameter for wet time. 

Thanks again for helping me.