I'm locking this up because this is very unlikely to happen, I will give you the main reasons:
1. It would allow players to buy one 48 hour boost, then log in simply for the power hours, hit 48 power hours which they NPC through or even just PvPing and completely exploit the system. This will get the response of 'just make it so it does not work during power hours' or something of such, thing is, then someone will ask for it not to count towards the time then, since it does not work in that hour... It just gets too complicated for what it's worth.
2. AQW is no primarily a PvP game and the PvP in it is something you are free to do on the side for a bit of fun. On the other hand, EpicDuel is a PvP game, the credits you earn and the experience all effects the game and subsequently other players therefore giving people who purchase boosts such a large period of time and opportunity to earn much more than others just does not work.
3. The idea of the boosts is you have an option. If you feel you can get more that one hundred wins in 48 hours, you choose to purchase the 48 hour boost, then you have 48 hours to do as much as you can. However, if you feel you will get more from a 100 wins boost, because you do not feel you can get more out of a 48 hour boost that's an option as well as the smaller option if only a small boost is required.
At the end of the day the options are not there to give you super easy experience and credits so you can go from level 20 to 40 in the space of 2 weeks playing during the power hours etc. they are there to give you the option to get easier experience and credits if you want a boost, not an OP boost, but one that has good but limited/fair effects.