Hacker News Reader

you can't use tourist visa to enter the US and attend college/grad school.

Each visa type has a different duration, and you can't study on a tourist visa.

I've had a visa that allowed me to work for 3+ years in the US, but was valid only for 90 days. Every time I left the country I had to renew it, a process which takes an indeterminate amount of time.

Depends on a country, most is 10 - https://en.wikipedia.org/wiki/Visa_policy_of_the_United_Stat...