Unless it is in trouble root wise, you should really wait to re-pot until new growths are just showing some roots. Many cattleyas bloom once a year but others bloom several times. Usually once new growths are mature and the buds can take a long time to develop. So it is hard to say exactly for the many hybrids out there. Same thing with how long the blooms will last. Some last a week or two and others (my smaller blooms) last for many weeks. I don't have this hybrid so can't really say how big it will get. It is a mature plant already with several bloom spikes, so not likely a lot taller but could grow more pseudo bulbs and therefore get wider and need a larger pot.
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