Reduce precision of time studied today

[vaibhav]

@tbm

My proposal would be:

• For time studied today, show full minutes. If more than one hour, show hour and full minute (1h 20m)
• Keep the dd.dds/cards precision. I think it’s too much but clearly some users like it.
• For “show next card”, round minutes, hours and days to full integer values (5m; 5h; 5d) and show one level of precision for years (1.2y)

I agree. I would add:

• For “show next card” (answer buttons in reviewer), show one decimal level for months too.
• If the time studied today (not the time per card) is <60 seconds, round it to the nearest second.