Hi,<br/><br/>Could you tell me which sentence a native speaker is more likely to utter?<br/><br/>1. It took him a full twenty minutes to conclusively decide on the case.<br/><br/>2. It took him full twenty minutes to conclusively decide on the case.<br/><br/>In fact I've seen a couple of times such use of "a", but grammar-wise it irkes me to see "a" preceding a word in plural (minutes)<br/><br/>Thanks!