Is there such a thing as too many showings?

I mean showings are good (1o in 2 1/2 weeks)...I am grateful for all the activity.... but how many times can I clean this housse? I have never ran the vacuum so much in all my life. It has been so crazy. I can't even describe it. Trying to get the house ready for a showing by myself with two young kids. It is like the greatest juggling event of all time. My goal is to keep the kids stationary for at least 45 minutes so I can sweep, vacuum, mop, and straighten up.....and no doubt...they are loosing brain cells because of it. For Will, I give him his DS or turn on cartoons. For Sissy, I pull up itunes on the computer and let her watch a few episodes of Bubble Guppies. Somehow, the cleaning always gets done and the showings always take place. I just hope that they don't remember this time of their life with momma running around like a crazy woman and them being stuck in front of a TV, computer, or gaming system. Not my finest moments as a mother.