this already exists, though not in the format you propose. There are a few maintained effects windows on this site that will show ward remaining on top of the icon so you do not have to hover over it. As far as time to cast, id suggest ACT for timers, or just playing more so you get a rhythm down. For the window i like othesus' maintained because it comes with three different size icons to choose from and the largest one really stands out more in 1400x1050.
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