In Naked Leader (great book - its in the side bar) David Taylor says "Imagine this...you have gone to a seminar and they ask everyone to put their business cards into a box. The idea being that one will be picked out and they will win an all expenses paid trip to Bahamas...the bad news you depart tomorrow. Would you go? The majority of us would find away.
If that is you then you do have time, you are not indispensable.....you just have to prioritise. Time is an asset, you can choose what you want to do with it.
Do you want to look back and say I wish I had done that! I suspect no, so look at your diary and see what you are doing that could be delegated as part of someone elses development, meetings that could be stopped, could be shortened - why are meetings 30mins or 1 hour? Make them 20 or 40 mins....imagine then what you could do with the time. Live your dreams