Patching Trainz with software updates like Hotfixes, Service Packs and patches can take from 30 seconds to over 10 hours depending upon the computer speed, Disk I/O speed, the type of software change and whether it also has to modify assets. This is one in a series of such documenting such behavior and showing users what to expect in the series of b:Trainz/Introductory Trainz Wikibook tutorials.