Less than half are on LOA, and some that are have already extended beyond the 3 years.
A friend of mine recently committed suicide- after 12 years at QF he was still a 747 SECOND officer and in danger of losing his job- the pressure, negativity and zero prospects got to him I guess.
I re- met another colleague recently. He had similar time in QF, was a Junior FO on the 767, had been on permanent reserve for five years, and was now looking at being demote to SO.
Being senior at QF would be great- but it's no surprise some of those those with less than 20 years up are looking at the ME.