It can take several months, possibly more than a year to find a job (it took me 2 years in the recession).
However, it’s unlikely you will find something that pays close to what you got in the US, because salaries are much lower in general here... a lot of people end up having to take about a 50% paycut for a similar job in the UK. Bear in mind that around 90% of the UK population earns less than about £40,000-45,000.
In the US, my job would pay around $70,000... yet salaries for the same job here in the UK are about 50-70% of that amount.
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