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If you have low endurance, you should definitely start off slow. Here’s an idea:

1st week: Train 3x a week
Do sets of 2×10 mins.
Do a low speed that you’re comfortable with.
For the 2nd set, raise it a bit.

2nd week: Train 3x a week
Do sets of 3×10 mins.
Raise the speed slowly by only a few miles/day.

3rd week: Train 3x a week
Do sets of 4×10 mins.
Keep the speed or slowly raise it if you can.

4th week: Train 3x a week
Do sets of 3x15mins

You get the idea…
In the end, you should be able to do a full hour (with and without brakes).

Good luck and try to keep your training fun… listen to good music!!

Try this calculator:

Yes U can split it up. better to work up to 30 full.

Vary Ur speeds.