Looking good so far.
If Humbrol enamels, in matt, they should be touch-dry in around 30 minutes to one hour, and fully hardened in around six to twelve hours. If not, then they either need stirring fully, or you've got a tin exhibiting the recent problems with these paints. The consistency of quality has been poor since the demise of the original UK Humbrol factory, and I don't know where they're made now.