Three months of expenses, six months, a year. The advice is everywhere and none of it is about you. Put in what you actually have to pay every month and how steady your situation really is, and get one number to aim at.
Step 1 of 3
What you have to pay every month if everything else stops. Not your fun spending, just the bills that do not care that you lost your income.
Step 2 of 3
Four questions. These are what move the number up or down, and they are the reason a blanket "six months" answer does not fit anybody in particular.
Step 3 of 3
Now the part that turns a target into a date.
This is a widely used rule of thumb, not financial advice. It scales the standard three to six months of essential expenses up or down based on how steady your situation is. Your circumstances may call for something different, and nothing you type here leaves your browser.