diff --git a/libi2pd/SSU2.cpp b/libi2pd/SSU2.cpp
index b8d5b61e..fc92c747 100644
--- a/libi2pd/SSU2.cpp
+++ b/libi2pd/SSU2.cpp
@@ -729,7 +729,7 @@ namespace transport
 
 	void SSU2Server::ScheduleResend ()
 	{
-		m_ResendTimer.expires_from_now (boost::posix_time::seconds(SSU2_RESEND_INTERVAL));
+		m_ResendTimer.expires_from_now (boost::posix_time::milliseconds(SSU2_RESEND_CHECK_TIMEOUT));
 		m_ResendTimer.async_wait (std::bind (&SSU2Server::HandleResendTimer,
 			this, std::placeholders::_1));
 	}
@@ -738,7 +738,7 @@ namespace transport
 	{
 		if (ecode != boost::asio::error::operation_aborted)
 		{
-			auto ts = i2p::util::GetSecondsSinceEpoch ();
+			auto ts = i2p::util::GetMillisecondsSinceEpoch ();
 			for (auto it: m_Sessions)
 				it.second->Resend (ts);
 			for (auto it: m_PendingOutgoingSessions)
diff --git a/libi2pd/SSU2.h b/libi2pd/SSU2.h
index 1625080b..010c2c00 100644
--- a/libi2pd/SSU2.h
+++ b/libi2pd/SSU2.h
@@ -17,7 +17,8 @@ namespace i2p
 {
 namespace transport
 {
-	const int SSU2_TERMINATION_CHECK_TIMEOUT = 30; // 30 seconds
+	const int SSU2_TERMINATION_CHECK_TIMEOUT = 30; // in seconds
+	const int SSU2_RESEND_CHECK_TIMEOUT = 500; // in milliseconds
 	const size_t SSU2_SOCKET_RECEIVE_BUFFER_SIZE = 0x1FFFF; // 128K
 	const size_t SSU2_SOCKET_SEND_BUFFER_SIZE = 0x1FFFF; // 128K
 	const size_t SSU2_MAX_NUM_INTRODUCERS = 3;
diff --git a/libi2pd/SSU2Session.cpp b/libi2pd/SSU2Session.cpp
index 5b451e00..4846446f 100644
--- a/libi2pd/SSU2Session.cpp
+++ b/libi2pd/SSU2Session.cpp
@@ -265,7 +265,7 @@ namespace transport
 	{
 		if (!m_SendQueue.empty () && m_SentPackets.size () <= m_WindowSize)
 		{
-			auto nextResend = i2p::util::GetSecondsSinceEpoch () + SSU2_RESEND_INTERVAL;
+			auto nextResend = i2p::util::GetMillisecondsSinceEpoch () + SSU2_RESEND_INTERVAL;
 			auto packet = std::make_shared<SentPacket>();
 			size_t ackBlockSize = CreateAckBlock (packet->payload, m_MaxPayloadSize);
 			bool ackBlockSent = false;
@@ -344,7 +344,7 @@ namespace transport
 		bool ackBlockSent = false;
 		uint32_t msgID;
 		memcpy (&msgID, msg->GetHeader () + I2NP_HEADER_MSGID_OFFSET, 4);
-		auto nextResend = i2p::util::GetSecondsSinceEpoch () + SSU2_RESEND_INTERVAL;
+		auto nextResend = i2p::util::GetMillisecondsSinceEpoch () + SSU2_RESEND_INTERVAL;
 		auto packet = std::make_shared<SentPacket>();
 		if (extraSize >= 8)
 		{	
@@ -414,7 +414,6 @@ namespace transport
 					uint32_t packetNum = SendData (it->second->payload, it->second->payloadSize);
 					it->second->numResends++;
 					it->second->nextResendTime = ts + it->second->numResends*SSU2_RESEND_INTERVAL;
-					m_LastActivityTimestamp = ts;
 					resentPackets.emplace (packetNum, it->second);
 					it = m_SentPackets.erase (it);
 				}
@@ -486,7 +485,7 @@ namespace transport
 		// we are Alice
 		m_EphemeralKeys = i2p::transport::transports.GetNextX25519KeysPair ();
 		m_SentHandshakePacket.reset (new HandshakePacket);
-		auto ts = i2p::util::GetSecondsSinceEpoch ();
+		auto ts = i2p::util::GetMillisecondsSinceEpoch ();
 		m_SentHandshakePacket->nextResendTime = ts + SSU2_HANDSHAKE_RESEND_INTERVAL;
 		
 		Header& header = m_SentHandshakePacket->header;
@@ -505,7 +504,7 @@ namespace transport
 		// payload
 		payload[0] = eSSU2BlkDateTime;
 		htobe16buf (payload + 1, 4);
-		htobe32buf (payload + 3, ts);
+		htobe32buf (payload + 3, ts/1000);
 		size_t payloadSize = 7;
 		if (GetRouterStatus () == eRouterStatusFirewalled && m_Address->IsIntroducer ())
 		{
@@ -587,7 +586,7 @@ namespace transport
 		// we are Bob
 		m_EphemeralKeys = i2p::transport::transports.GetNextX25519KeysPair ();
 		m_SentHandshakePacket.reset (new HandshakePacket);
-		auto ts = i2p::util::GetSecondsSinceEpoch ();
+		auto ts = i2p::util::GetMillisecondsSinceEpoch ();
 		m_SentHandshakePacket->nextResendTime = ts + SSU2_HANDSHAKE_RESEND_INTERVAL;
 		
 		uint8_t kh2[32];
@@ -609,7 +608,7 @@ namespace transport
 		size_t maxPayloadSize = m_MaxPayloadSize - 48;
 		payload[0] = eSSU2BlkDateTime;
 		htobe16buf (payload + 1, 4);
-		htobe32buf (payload + 3, ts);
+		htobe32buf (payload + 3, ts/1000);
 		size_t payloadSize = 7;
 		payloadSize += CreateAddressBlock (payload + payloadSize, maxPayloadSize - payloadSize, m_RemoteEndpoint);
 		if (m_RelayTag)
@@ -700,8 +699,7 @@ namespace transport
 	{
 		// we are Alice
 		m_SentHandshakePacket.reset (new HandshakePacket);
-		auto ts = i2p::util::GetSecondsSinceEpoch ();
-		m_SentHandshakePacket->nextResendTime = ts + SSU2_HANDSHAKE_RESEND_INTERVAL;
+		m_SentHandshakePacket->nextResendTime = i2p::util::GetMillisecondsSinceEpoch () + SSU2_HANDSHAKE_RESEND_INTERVAL;
 		
 		uint8_t kh2[32];
 		i2p::crypto::HKDF (m_NoiseState->m_CK, nullptr, 0, "SessionConfirmed", kh2, 32); // k_header_2 = HKDF(chainKey, ZEROLEN, "SessionConfirmed", 32)
diff --git a/libi2pd/SSU2Session.h b/libi2pd/SSU2Session.h
index deb198f8..d8c7ce4f 100644
--- a/libi2pd/SSU2Session.h
+++ b/libi2pd/SSU2Session.h
@@ -35,7 +35,7 @@ namespace transport
 	const size_t SSU2_MAX_PACKET_SIZE = 1500;
 	const size_t SSU2_MIN_PACKET_SIZE = 1280;
 	const int SSU2_HANDSHAKE_RESEND_INTERVAL = 1; // in seconds
-	const int SSU2_RESEND_INTERVAL = 3; // in seconds
+	const int SSU2_RESEND_INTERVAL = 300; // in milliseconds
 	const int SSU2_MAX_NUM_RESENDS = 5;
 	const int SSU2_INCOMPLETE_MESSAGES_CLEANUP_TIMEOUT = 30; // in seconds
 	const size_t SSU2_MIN_WINDOW_SIZE = 8; // in packets
@@ -189,7 +189,7 @@ namespace transport
 		{
 			uint8_t payload[SSU2_MAX_PACKET_SIZE];
 			size_t payloadSize = 0;
-			uint32_t nextResendTime; // in seconds
+			uint64_t nextResendTime; // in milliseconds
 			int numResends = 0;
 		};
 
@@ -199,7 +199,7 @@ namespace transport
 			uint8_t headerX[48]; // part1 for SessionConfirmed
 			uint8_t payload[SSU2_MAX_PACKET_SIZE*2];
 			size_t payloadSize = 0;
-			uint32_t nextResendTime = 0; // in seconds
+			uint64_t nextResendTime = 0; // in milliseconds
 			bool isSecondFragment = false; // for SessionConfirmed
 		};