Days to first sale

You’re working as an analyst for a sales organization and you’re asked to figure out how long it takes for a sales representative to make their first sale. You’re also given the following tables:
Table 1: sales_rep_info

column	description
sales_rep_id	unique sales rep identifier
date_hired	hire date of employee, format 'YYYY-MM-DD'
product_focus_area	types of products the rep sells
tenure	total yrs of sales experience
level	employee level at the company

Table 2: all_sales

column	description
date	close date of sale, format 'YYYY-MM-DD'
purchase_order_number	unique identifier for the sale
buyer_id	the unique identifier for buyer
sales_rep_id	unique sales rep identifier of the
order_price_usd	total sales price in USD
date_sale_initiated	date the purchase order was initiated, format 'YYYY-MM-DD'

Can you write a SQL query that shows how long it takes for a sales representative to make their first sale?