Also like people, some companies don't make arrangements for change until the very last minute.
The major complaint from industries at the moment is that they do not know what changes they are supposed to be making and yet Johnson and Gove keep insisting that they have to be prepared by January 1st and that if there is chaos and shortages, it will be the fault of the businesses. This despite there being no chance of new customs facilities being ready by January 1st, 50,000 new customs agents, vets and plant experts have not been recruited, a new IT system is nowhere near ready (and won't be for at least another 6 months) - but the government line is still that it is businesses that have failed to prepare. Classic gaslighting.
The Association of the British Pharmaceutical Industry (ABPI) said on Monday that the industry still does not have details of the regulations it will be operating under after 1st January. This affects 82 million packs of drugs moving between the EU and the UK every month - which is a pretty big deal if your health and wellbeing is dependent on being able to access the medicines that you need. For diabetics who need insulin, 99% of which comes from the EU, this is vital and worrying.
Similar situations exist for importers of medical devices, chemicals, foodstuffs and more.
The biggest threat to Britain after Brexit is not the EU, or the industries and businesses that import and export. It is the sheer incompetence of the two dilettante journalists playing at being politicians who lack even the most basic understanding of trade and business.
When the country needs a man who understands trade, industry, security and international relations, it gets Gove - a man who doesn't know what he doesn't know and is happy to display his ignorance and arrogance at every opportunity