What are the most common ways to decrease the time of a cash flow cycle?

reduce the DSO as much as u can and delay payments of your sppliers, of course you should not upset them 

Try to speed up the production process by processing and selling goods more quickly and speed up the collection of receivables.
Regarding payables, slow down your payments but don't incur late charges.
Shortening the cash conversion cycle will free up more working capital for your business.

In order to reduce the cash flow cycle (increase current cash on hand) a firm can either decrease Inventory Days on Hand, decrease Average Collection Period or increase Days Payable Outstanding.

1.
Reduce the credit terms with the clients or go for less credit with new customers if it is too difficult to change the existing client.
2.
Maximise the credit terms with Vendors, go for negotiation and try to increase the cycle.
3.
Reduce the level of Inventory and order should be based on the marketability.
maintain only Minimum order quantity.
try to have the maximum inventory turnover for the period.
4.
Proper effort on collection, periodic review on AR is must and push for money at the earliest.
5.
we cant delay payments for a long just for our cash cycle.
we need to have a balanced cash flow and take maximum advantage to pay for outflows and give less advantage to clients.

Speed up collection,keep check on credit limit and credit period.Try to have maximum credit period for payments from the supplier.

encourage prompt payment

Delay the payments as you can but not at the cost of loss your supplier and received the cash from your customers by allowing them discounts, motivating them , credit rating the customers of your firm and intimate the same to your customers to improve their rating