Yes this will consume a lot of their time which they are already short of
Time? Time is not an issue at all. Rather excess labor in agri sector is the prime issue of Pakistan.. We have times excess rural labor compared to avaiable land and water. Excess labour stops mechanization and efficiency. Sunday markets create rural base employment opportunities - which we need badly. That's the main benefits. Farmer's market also generate food processing/packaging related job opportunities for households which further increases efficiency and income. Third benefit is direct cash inflow -which has certain poverty-reduction benefits. Social change and independence is another plus. These are all pluses and a few more.
However as I have commented above, I don't recommend farmer's market as an agri-policy and food/price management at all. This is not a solution either for farmer's wages or for consumer price - nor it is an efficient way to produce and manage food supply. Its scale is quite small to count as an agri-policy anyway. Our problems are structural , mechanization, efficiency , policy related and rural investment. Mehngai is a fake issue raised by urban middle class which doesn't wants to pay full price to farmers and exploit them - and politics is controlled by middle class for its own benefits. However all that needs long discussion to compare and assess various models which can be adopted in our circumstances I won't go there as it is not a thread about agri policy..
Nevertheless, our current Arhat (middleman) system is outdated, inefficient and exploitative especially for the farmers and villages. It puts little back to rural economy and profits are invested in cities. Problems or out current market system are well known. Another factor which has immensely harmed out farmers and distorted market in favor of middlemen is Nawaz policy of imports from India. That was almost a criminal policy and till now we are suffering from that policy.
