Hi She11e
It certainly sounds like your EC are acting on getting the repairs done to common property, so kudos to them.
As to the act, it only states that the repairs/maintenance should be reasonable: from what you have to described, these birds aren’t really a safety issue.
By the sounds of your description (needing a cherry picker, rotten/destroyed woodwork, points of access needed) this is not an easy or straight-forward excercise; presumably there are also issues such as waterproofing, quotes, engaging builders and tradespeople to be considered – bear in mind that the builder who does the eaves and woodwork may not do the guttering, so the EC or SM will need to co-ordinate to existing schedules, then there’s someone to be onsite a pest controller (etc)
One month doesn’t sound unreasonable at this moment: perhaps a quick chat with the EC to find out what dates they are looking at getting the work done will shed some light on the subject. If they don’t have any dates in mind, or want to go to another EGM, at that point it will be time for you to up the ante.