I am a manager at a growing small business.  Though our business has
been profitable and is profitable, we are going through a cash flow
crunch.  In the last 3 months, we have grown from an average of
$100,000 per month in business to $350,000 per month in business.  Our
credit line is currently only $60,000 and our average turnaound
between performing work and receiving payment is 45 days.

Please provide recommendations about what the appropriate credit line
for this revenue level and billing cycle should be.

I suspect our credit line is not large enough.

Depending on what type of business you are and what you're are needing
to finance (i.e. inventory and/or accounts receivable), you might
qualify for an asset based loan instead of a general commercial line
of credit.

Asset based loans (ABL) work great for growing business with tight
cash flow but high quality receivable and inventory.  You'll be
allowed a borrowing base that is a sum of your eligible inventory
times and advance rate (50% to 70%) plus your eligible receivable
times a receivable advance rate (70% - 90%).

ABLs are much cheaper than factoring your receivables.

If you post some more information about what you do and what type of
assets you hold, I'd be happy to offer some more in depth
recommendations.