This is typically set at the companies last funding round.
This varies greatly, but is determined by your role at the company, and when you join.
You'll have to ask the company for this, and is a huge red flag if they won't tell you.
The earlier you join a startup the less you typically have to pay for the options.
Normally 4 years, but you might be able to negotiate this down.
You own {{pct_ownership | numberFormat }}% of the company
{{profit | currency}}*
{{profit_per_year | currency}} / year
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* You could pay as much as 40% in taxes