After all we need time more than speed.

And we need more time for engine warm up.
So we decided to avoid any heated up day time riding.  We have to get up early as regular people, so we can ride in cool and fresh air in the morning.
And we try to remember to ride very casually while chatting with each other for a while longer than before.  And gradually speed up, just once sprint for a short distance, and go back to our comfortable speed zone.

I still can't ride long enough to reach one hour riding, but I'm getting close to it.  

After one day off yesterday, we slept for 9 hours accidentally, we felt so good.  We enjoyed riding for a while, but it was a late start today, and the temperature went up soon.  We gave up and came back.  If we started earlier as usual, we might have ridden for 8 or even 9 miles.

OK. next time.