I'm new to futures trading but not in crypto.

I like to hold coins for long term but right now im interested in futures trading and there is a thing i don't understand and cannot find answer on internet (lol).

Lets say i bought long BTC/USD at $47,000 and if bitcoin goes down like at $42,000 will my open order will be canceled automatically without my permission and lose my money. I know stop limit loss but im not interested at this right now because im always behind my computer. Also... Can you hold open orders like for a year and if it goes up i take alot of profits.. My concern is only if im at loss i don't like to sell and lose, i always wait for the price to go up at the same price i bought. English is not my first language if my question is not clear please let me know i'll try to explain below in comments. Thank you.