1) General subject: continued, durable, enduring, everlasting, extended, great, lasting, lengthy, lingering, long, long-term, longstanding, of long continuance, of long standing, prolonged, protracted, sustained, time-consuming, ongoing, longtime
2) Medicine: long-lasting, long-standing, long-term effect
3) Military: sustaining (о боевых действиях)
4) Agriculture: chronic
5) Grammar: continuous
6) Mathematics: long-continued, long-duration
7) Economy: long-term (о периоде времени, в течение которого все факторы могут измениться)
8) Accounting: long-run, tedious
9) Jargon: over the long haul
10) Oil: long-life, time consuming
11) Quality control: long-lived
12) Makarov: long-lived (о свойстве, процессе), long-term (напр. по нагрузке), permanent, slow, steady-state
Универсальный русско-английский словарь. Академик.ру. 2011.