долгосрочный означает в английский

long-range▼(Involving a great period of time)
adjective
[UK: ˌlɒŋ.ˈreɪndʒ] [US: ˌlɔːŋ.ˈreɪndʒ]

long-term [longer-term, longest-term]▼(extending over a relatively long time period)
adjective
[UK: ˈlɒŋ tɜːm] [US: ˈlɔːŋ.ˈtɝːm]