To answer the original question: You may safely wait until you get home to clean the pistol. Several hours shouldn't be a problem. However, the corrosive properties (salts from the priming compound) begin work quickly and overnight is too long.
Hot, soapy water may be the best solution for neutralizing and flushing out the corrosive salts. Follow that with the usual nitro-solvent cleaning and after making sure all of the water has been removed, a light oiling.
If using hot water worries you, I've used Hoppe's No. 9 solvent for nearly half a century with good results. The label clearly states that it's good for corrosive priming. Others claim it doesn't work and there have been numerous arguments over it's value as a corrosive cleaning solvent.
However you decide to clean the bore, breechface and breech area, do it within two or three hours and you'll be fine.
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