When you're in a guild that takes these seriously with lots of planning/coordination it is a serious time sink on top of all the other mandatory activities.
For those who say "well, just leave and join a less-serious guild" remember, many of us joined when it was just raids, and that a few of those per week are no picnic. Within a few months they've added two 6-day long events and now another 24-hour one, each of which runs several times per month. On one hand, great that we have new content and new things to work towards but way too much too quickly.
The easiest solution to me would be to shorten the length of TB battles (which I know has been discussed a lot) and/or the frequency. Then limit TW to every 10 days or 2 weeks, whatever gives us a few off days between each guild event.