Congrats on your baby
How many feeds is he having in 24 hours and what is his nappy output like?
8-12 feeds in 24 hours is normal, so that's roughly 2-3 hourly (though babies don't tend to feed on a regular schedule). One long sleep is ok, so long as your baby is getting enough milk for the rest of the day. Are you familiar with the indicators of adequate milk intake?

As a general rule, I'd suggest waking a very sleepy baby at least every 3 hours to aim for a minimum of 8 feeds in 24 hours. Often what happens is that once you've successfully woken them and gotten more milk in for a few days they perk up and start waking and demanding milk on their own.