We planned on the following:
City highlights
Catherines Palace
Hermitage
Peterhov
Spilled blood
St Issacs
Peter fortress
just 30 min stops at church nothing crazy.....eatig on the go...sandwiches or something.....some of the tour guides even offer metro ride and some shopping....so a little confused.
That's what you want to do over the full two days? You can definitely do that. Red October doesn't sound like it's flexible enough. For example, you could do a city tour, Peterhof and Peter and Paul Fortress on the first day (take the hydrofoil to Peterhof to save time) and then start the 2nd day with Spilled Blood and St. Isaacs, do Hermitage around lunch and then go to Catherine's. That's more or less what we're doing. Don't worry, just use a different tour company!