In reply to papashango:
A friend of mine went from a previous best of 6c to 8a+ in 3 months.
It's a bit of a how long is a piece of string question.
He came out to Spain very strong but not very fit. Climbed every day as long and hard as he could and within a month was also super fit. Then he started projecting and the end results speak for themselves.
This year he is on his way from 8a+ to 8b+ in the same time schedule.
As you get towards your natural limits the progression gets slower.
Are you wanting to become an all round climber on all styles of routes and a good on-sighter or do you want to get a big number in your favourite style of climb ?
If you're climbing 3-5 times per week you have a lot of time to train.Are you using structured sessions or just going to the wall and climbing. Read up or search here and on UKBouldering for what you could be doing. Train smart and that will give you more time and energy to devote to other stuff.
Sicily will give you a great chance to find what areas you may be weak in ( including fear of falling etc. ) and then get cracking.
Good luck.
With the time you have available and the pre trip trip to Sicily you should smash your goals.