Yes, bet365 is a trustworthy online gambling site. They are licensed and regulated by the UK Gambling Commission and have been in business since 2001.
If you are using a Visa Debit Card and your bank is eligible for Visa Direct, your withdrawal should be received within two hours. If your bank is not eligible for Visa Direct or you are withdrawing to a Mastercard, withdrawals should clear in 1-3 banking days.