Probably another form for palin (through the idea of retrocession); (adverbially) formerly, or (by relatively) sometime since; (elliptically as adjective) ancient -- any while, a great while ago, (of) old, in time past.
KJV: Woe unto thee, Chorazin! woe unto thee, Bethsaida! for if the mighty works, which were done in you, had been done in Tyre and Sidon, they would have repented long ago in sackcloth and ashes.
NASB: "Woe to you, Chorazin! Woe to you, Bethsaida! For if the miracles had occurred in Tyre and Sidon which occurred in you, they would have repented long ago in sackcloth and ashes.
KJV: Woe unto thee, Chorazin! woe unto thee, Bethsaida! for if the mighty works had been done in Tyre and Sidon, which have been done in you, they had a great while ago repented, sitting in sackcloth and ashes.
NASB: "Woe to you, Chorazin! Woe to you, Bethsaida! For if the miracles had been performed in Tyre and Sidon which occurred in you, they would have repented long ago, sitting in sackcloth and ashes.
KJV: Again, think ye that we excuse ourselves unto you? we speak before God in Christ: but we do all things, dearly beloved, for your edifying.
NASB: All this time you have been thinking that we are defending ourselves to you. Actually, it is in the sight of God that we have been speaking in Christ; and all for your upbuilding, beloved.