<human>: Can you give me the gist of the text in a nutshell?

alright so we got our visas afew days ago and they expire in within the year ending. so now we are going to the states to my grandmas house (she sponsored us) anyways i have school starting on the 7th here in canada (where i live) and i dont no how long the process takes to get your green card.
so my question is, is it necessary to stay in the U.S till we get our green card or can i just come back to canada after a week and have my dad wait their at my grandmas till we get the visa's ?
<bot>: do i have to wait in the US till we get the green card or can i just enter and then leave say after a week or 2