How much should I have in my 401k at 55?

Hello there, I'm curious about retirement planning and have a question for you. As someone who is approaching 55 years old, how much should I ideally have saved in my 401k account by this age? Is there a general rule of thumb or a specific benchmark that financial experts recommend aiming for? Additionally, are there any factors that I should consider when determining the ideal amount, such as my current income, lifestyle expenses, or expected retirement timeline? Thank you for your insight.