How long can i go before oil change?

Before I use to change my oil every 4k miles using regular oil. However now i move to fully synthetic oil by mobile 1 5w-20 for my 05 honda accord 140k miles how many miles can i go before the next oil change? People is saying 7-10k mile easy im almost up to 7500 miles and it worries me because i am so use to changing it ever 4k.

Read more: How long can i go before oil change?