You can leave hydrogen peroxide in your drain overnight. However, if you only have 10 free minutes or a few hours before you need to use the sink again, hydrogen peroxide will still be effective.
Hydrogen peroxide helps clear clogs rather than just eliminating odors.
To use hydrogen peroxide in the sink, pour cold water down the drain, followed by one cup of baking soda. Leave for 10 minutes before pouring one cup of three percent hydrogen peroxide down the drain. Leave it in the drain for at least a few hours, but you can wait overnight.
Pour hot water down the drain to flush it clean.