Shimami Kaido - cycling

Hi,
Shimami Kaido connects 6 islands, is it possible if I only want to cycle from Onomichi to Ikuchijima island then return back to Onomichi . I'm a very basic cyclist, do you think how much time I need to do all my plan above?
Is there any rest area along the bicycle road?

Thank you so much

I got on the Shinkansen and JR line and arrived at Onomichi at 9:00 am from Kyoto. I went to Setoguchi by ship and borrowed a bicycle there. I went to the Oyamazumi shrine, and back to Setoguchi afterwards through the north of Omishima to Setoguchi. I returned on a ship to Onomichi, and I arrived there past 5:00 pm.
I stayed at the Onomichi at the night, next morning I got on the ship to Tomonoura watching the scenery of the shipyard.

https://www.tripadvisor.jp/Attraction_Review-g298131-d1384415-Reviews-...

Thank you for your response. I'm still thinking to go all the way from Onomachi to Imabari and back to Onomachi by bus, but I couldn't figure it out how long do I need until Imabari by bicycle . Do I need stay overnight at Imabari. My plan I'll leave Onomachi around 9 AM.

If you are the profesional cyclist, it should be possible.
It would be take 4-6 hours for general person to run the whole distance.
http://www.go-shimanami.jp/cycling/model/

It might be better to stay in Imabari.
http://www.cyclonoie.com/shimanamikaido-e.php#howlong

I would challenge this 4-6 h for a normal rider. It is 80-100 km depending on if you do some small detours. 80 km in 4 h thatfs 20 km/h steadily. This is obviously doable but itfs not entirely flat and you have to maintain the speed. Also you will stop often to admire the landscape take pictures etc. which easily adds 2 h. If you then want to visit some shrine , temple on the way. Add an other 1-2 h. Have lunch....

I found it enjoyable to do in 2 days. But it obviously depends on your personal speed and (!) on the type of bicycle you rent. The normal ones are a mamachari type. You canft really ride fast or far with them.

Here my experience: https://bicycletraveljapan.blogspot.com/2017/11/part-10-day-48-49-ridi....

In the planning section there is also more general information on the ride.

Enjoy riding the Shimanami Kaido!