How long for bud to open??

[Celtic100]

I have a catt that I think I saved from bud blast. I believe my house was too cool these winter months (I like it - my orchids don't apparently). I decided to warm it up by placing it in a clear plastic bag and put a small light on it to warm it up during the day. Voila! the sick looking bud transformed into a deeper color and a larger size. The picture shows it after 16 days in this treatment growing but not opening. Last summer it took about 11 days to go from fat bud to open flower. Do you think this is due to its "sick" start or do things just take longer in the winter season? Do buds ever NOT open when they are that large - do they just sit and eventually fall off? Perhaps this query is rife with obvious statements, but it seems to be taking a long time for this bud to do its thing!! (and I'm anxious to see it again). Thanks very much for your thoughts.

I mistakenly put this thread in the wrong category - should be in cattleya alliance. Sorry for mistake.