If you have $100m, the implication is that the VCs want to see a unicorn (>$1 billion). You will be engaging in a lot of sales, marketing and engineering activity to get there. Your activity is expensive.
And nobody is getting $100 million anymore. Good raises are now in the $10 million range and that doesn't last long at all even if you only have a small number of employees.
Outside where? The EU? Plenty long... like 5 years?
150K per employee on average with overhead (additional benefits, tax contributions, health care -- whatever other expenses). 15,000,000 a year.
Add in real estate, equipment, other capital expenses. Yeah, looks like ~5 years.