Can any damage be done when air lock is removed for about 3 to5 minutes. I repitched yeast this morning.what can I expect?
Don't worry, your beer or wine will be fine.
Of course you have air in your fermenter anyway, and air always has some wild yeasts and bacteria. But when you pitch your yeast, it quickly overpowers anything else that may be in there. It uses up the oxygen and creates alcohol, making the whole environment unfriendly to many other microbes.
Besides later keeping wild yeast and bacteria out, the airlock also blocks insects like fruit flies, which can be attracted by the fermentation. You probably didn't get a bunch of flies in your fermenter in 3 to 5 minutes, and even if you did, you can just take them out when you bottle or keg.
"What can I expect?" Beer.
Seriously, let's step through this: Normal air is about 78% Nitrogen which has an atomic mass of about 14. CO2 has an atomic mass of about 44. CO2 is much heavier than air. So, there will be a cushion of CO2 under any air that got into your fermenter, as long as you didn't agitate it.