Gates Industries balance sheet and income statement for the year ending December 31, 1978 are as follows:

Balance Sheet ($ million)

Cash$10.0

Accounts payable$15.0

Accounts receivable15.0

Salaries, benefits, & payroll taxes payable3.0

Inventories*12.0

Long-term debt15.0

Fixed assets (net)30.0

Stockholders' equity34.0

Total assets$67.0

Total liab. & stock. equity$67.0

Income Statement ($ million)

Net sales (all credit)$125.0

Cost of sales75.0

Selling, general, & admin. expenses30.0

Other expenses13.0

Earnings after tax$7.0

*Note: Average inventories also equal $12.0 (million).

Determine the length of the firm's cash conversion cycle.