Hey I'm with BEVPRESLEY...go with what works for you. There's no harm in pushing yourself even a bit beyond your comfort zone as long as you don't allow your aches and pains to sideline you and pull the plug from your enjoyment.
In addition to speed I think resistance ala *HILLS* will be important to incorporate into your rides as well. But it's all in what "works" for you.
If you've got more miles in you and you have the time to keep going then, heck, GO FOR IT! :-)
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