Mike Milbury, the Islanders coach and general manager, said yesterday that he was prepared for lengthy and perhaps frustrating negotiations with Zigmund Palffy.

He had endured some frustrating negotiations where he had dealt with races whose concept of time meant that a meeting scheduled months in advance might take place hours, days, or even weeks after Fox arrived.

Most of the Marielitos have resettled successfully but it took years of frustrating negotiations to repatriate the criminal remnant.

Through endless and often frustrating negotiations, the Reagan Administration forced Japan to sweep away trade barriers affecting everything from beef and citrus to financial services.

And throughout his anxious, frustrating negotiations in Sydney he had been chaste, because of total exhaustion by the end of the day.

After months of frustrating negotiations, the Bell Atlantic Corporation and Tele-Communications Inc. said last night that they had terminated plans for the largest merger in history.

After long and frustrating negotiations, the five missionaries were released.

Everything that we have done so far - the four years of difficult and often frustrating negotiations, the problems and the crises - have been simply a preparation for the work that lies ahead.

The I.R.A. must scrupulously maintain its cease-fire through the start of those talks, scheduled for mid-September, and then continue it throughout what are sure to be difficult and frustrating negotiations.

After two years of frustrating negotiations, he has been pressed to take a hard line by several members of his Administration.