Bruce Corporation makes four products in a single facility. These products have the following unit product costs:

	Products
A	B	C	D
Direct materials	$ 14.90	$ 10.80	$ 11.60	$ 11.20
Direct labor	20.00	28.00	34.20	41.00
Variable manufacturing overhead	4.90	3.30	3.20	3.80
Fixed manufacturing overhead	27.10	35.40	27.20	37.80
Unit product cost	$ 66.90	$ 77.50	$ 76.20	$ 93.80

Additional data concerning these products are listed below.

	Products
A	B	C	D
Grinding minutes per unit	4.40	5.90	4.90	4.00
Selling price per unit	$ 76.70	$ 94.10	$ 88.00	$ 104.80
Variable selling cost per unit	$ 2.80	$ 1.80	$ 3.90	$ 2.20
Monthly demand in units	4,600	4,600	3,600	2,600

The grinding machines are potentially the constraint in the production facility. A total of 54,200 minutes are available per month on these machines.

Direct labor is a variable cost in this company.

How many minutes of grinding machine time would be required to satisfy demand for all four products?