user14536: I have had experience in meditation, I want to have experience of living and learning with Buddhist monks.  Where in Asia can I experience this for 8 to 10 weeks to start?

user13992: Speaking from personal experience with stays at Zen monasteries in Japan: 
It depends on what you mean by retreat. Many Zen monasteries in Japan offer "retreats" in their web pages, but this is not necessarily what is meant in Japanese Zen by a sesshin (接心). If you want to experience the daily life of Buddhist monks in Asia, I'd advise not joining a sesshin for your first time in Japan, as this is an extremely intense period for the monks, and if you do not fully master the local language and the temple customs you will struggle. First time around, I would advise you stay at one or more temples during a regular period.
If you want to sleep, meditate, eat, and work with the monks you can contact the head temple or administrative office of a Buddhist lineage in Japan and ask for possible periods and places to stay (also, indicate if you need some help with the language and customs, as this will be taken into account proposing possible stays to you).
Here are some links you may find useful:
Shoganji Monastery - Rinzai lineage
Soto Zen monasteries for foreigners in Japan - Soto Lineage
ShinShoJi Temple - Rinzai Lineage
Shunkoin Temple - Mindfullness
Japan Vipassana Association
There's also shukubo in Japan, a kind of pilgrim lodging associated with nearby temples.

user13516: Many Westerners come to here to meditate, some become monks, some as laypeople.
International Buddhasāsana Meditation Centre
https://www.paaukforestmonastery.org/
You might also be interested in this monastery which the abbot has traveled to the deep forests and mountains in Karen State and meditated for many years. It is also common that several monks go to the forest and return only when they achieve a certain level of enlightenment. 
https://goo.gl/maps/BgDTUBbbDvQ2 
Note: Free of charge. Stay as long as you want. These are in Myanmar, so I am afraid you might end up like Jack Dorsey. 

user14468: If you're searching for Theravada Buddhist retreat in Sri Lanka you can visit,

Na Uyana Aranya Senasanaya
Mithirigala Nissarana Vanaya
Rathmalkanda Meditation Centre
Kanduboda Siyane International Insight Meditation Centre


14536: <p>I have had experience in meditation, I want to have experience of living and learning with Buddhist monks.  Where in Asia can I experience this for 8 to 10 weeks to start?</p>
 13992: <p>Speaking from personal experience with stays at Zen monasteries in Japan: </p>

<p>It depends on what you mean by retreat. Many Zen monasteries in Japan offer "retreats" in their web pages, but this is not necessarily what is meant in Japanese Zen by a <em>sesshin</em> (接心). If you want to experience the daily life of Buddhist monks in Asia, I'd advise not joining a sesshin for your first time in Japan, as this is an extremely intense period for the monks, and if you do not fully master the local language and the temple customs you will struggle. First time around, I would advise you stay at one or more temples during a regular period.</p>

<p>If you want to sleep, meditate, eat, and work with the monks you can contact the head temple or administrative office of a Buddhist lineage in Japan and ask for possible periods and places to stay (also, indicate if you need some help with the language and customs, as this will be taken into account proposing possible stays to you).</p>

<p>Here are some links you may find useful:</p>

<p><a href="https://zenretreat.com/" rel="nofollow noreferrer">Shoganji Monastery</a> - Rinzai lineage</p>

<p><a href="https://global.sotozen-net.or.jp/eng/temples/foreigner/index.html" rel="nofollow noreferrer">Soto Zen monasteries for foreigners in Japan</a> - Soto Lineage</p>

<p><a href="http://shinshoji.com/english/" rel="nofollow noreferrer">ShinShoJi Temple</a> - Rinzai Lineage</p>

<p><a href="http://shunkoinzentemple.blogspot.com/" rel="nofollow noreferrer">Shunkoin Temple</a> - Mindfullness</p>

<p><a href="https://www.jp.dhamma.org/" rel="nofollow noreferrer">Japan Vipassana Association</a></p>

<p>There's also <a href="http://eng.shukubo.net/" rel="nofollow noreferrer">shukubo</a> in Japan, a kind of pilgrim lodging associated with nearby temples.</p>
 13516: <p>Many Westerners come to here to meditate, some become monks, some as laypeople.<br>
International Buddhasāsana Meditation Centre<br>
<a href="https://www.paaukforestmonastery.org/" rel="nofollow noreferrer">https://www.paaukforestmonastery.org/</a></p>

<p>You might also be interested in this monastery which the abbot has traveled to the deep forests and mountains in Karen State and meditated for many years. It is also common that several monks go to the forest and return only when they achieve a certain level of enlightenment. 
<a href="https://goo.gl/maps/BgDTUBbbDvQ2" rel="nofollow noreferrer">https://goo.gl/maps/BgDTUBbbDvQ2</a> </p>

<p>Note: Free of charge. Stay as long as you want. These are in Myanmar, so I am afraid you might end up like Jack Dorsey. </p>
 14468: <p>If you're searching for Theravada Buddhist retreat in Sri Lanka you can visit,</p>

<ul>
<li><a href="http://nauyana.org/" rel="nofollow noreferrer">Na Uyana Aranya Senasanaya</a></li>
<li><a href="http://www.nissarana.lk/" rel="nofollow noreferrer">Mithirigala Nissarana Vanaya</a></li>
<li><a href="http://www.meditation.lk/" rel="nofollow noreferrer">Rathmalkanda Meditation Centre</a></li>
<li><a href="http://www.insight-meditation.org/" rel="nofollow noreferrer">Kanduboda Siyane International Insight Meditation Centre</a></li>
</ul>
