I don't like saving time - players play the game, I adjudicate. It isn't for me to make things easy for them, and rules like this make it easy.
If they wish to search 100 times, then roll 100 dice. Taking 20 is a soft option - as a mechanic, it presents too many opportunities for abuse. Besides which, search rolls should never be done by a player imho.
This is an RPG - that means, as a DM, the microcosm is as important, if not more so, than the macrocosm.
Where are your spell components stored? How many pinches of sand do you have? What hand is your character? How much food do you have left? How are you carrying all your gear? How are you lighting the torch with your hands full?
Magic items must be identified, wands don't usually have the command word carved onto them, armour rusts or goes out of shape in the rain, books get wet, familiars are randomly called, bows aren't carried for days already strung, some weapons are better at piercing armour than others....and you don't take 20 on searches.
You want everything spoonfed to you, where it's all easy and simple, magic items can be bought for 50k gold and so on? Then don't sit at my table. Treasure isn't always easy to carry, xp ain't handed out in clumps of 500 and going up a level doesn't make a 'ding'.