Small change to Clocktower
The idea behind the clocktower is to boost your overall base 3 times a day, once every 8 hours. However, you really can't use it 3 times a day. Some days you can, but other days you can only get it done 2 times a day. Use a level 3 clocktower as an example (it is a 10 minute boost and makes the math easy), if you wake up at 6am and have a boost available, it takes 10 minutes, so 6:10am. Now your next boost is available at 2:10 and finishes at 2:20. Next boost is available at 10:20 and finishes at 10:30pm. When you wake up the next day, your boost is now available at 6:30. So every day your boost start time will get pushed back 30 minutes (longer with a higher level clocktower, up to 42 minutes a day).
For those of you that played Clash Royale from the very beginning, you might remember that the card requests from your clan mates was initially once every 8 hours, so you could get it done 3 times a day as long as you did it with perfect timing, but that was difficult. I suggested it get changed to every 7 1/2 hours, but it was actually changed to every 7 hours so that you could be off slightly and still request 3 times a day.
As for the clocktower, Supercell needs to change the time between boosts to 7 1/2 hours (7 hours would be better), so that everyone could be off up to an hour or 1 1/2 hours a day and still get in the 3 boosts. This is a reasonable request since supercell put the clocktower in the game and they intend for us to use it 3 times a day.
Additionally, the clocktower should be stackable for up to 2 boosts, so the timer would start counting down regardless whether you start your boost on time or not.