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Personally I let them dry for one hour before putting on a setting solution and let that dry for one to two hours before spraying on a top coat. In your case, if wanting to use a setting solution like “Mark Softer” please first try it on a runner, so it won’t mess up the gold plating.
There are however people who let them dry for 24 hours before spraying a top coat on.
As long as you don’t overdo it with the top coat, a few hours should be fine, as long as the temperature your working in isn’t close to freezing temperatures. The water just needs time to evaporate.
Good luck and happy building